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6. Inventories
The cost of inventories recognized as an expense during the three and twelve months ended December 31, 2012 was $649.0 million (December 31, 2011 - $741.4 million) and $2,528.9 million (December 31, 2011 - $2,769.2 million). Superior recorded an inventory write down during the three and twelve months ended December 31, 2012 of $0.7 million (December 31, 2011 - $2.6 million) and $3.6 million (December 31, 2011 - $2.6 million), respectively. Superior recorded no reversals of inventory write downs during the three and twelve months ended December 31, 2012 and 2011.
7. Property, Plant and Equipment
---------------------------------------------------------------------------- Specialty Energy Services Chemicals Plant Retailing Land Buildings & Equipment Equipment----------------------------------------------------------------------------Cost----------------------------------------------------------------------------Balance at December 31, 2011 29.7 147.0 728.4 591.5----------------------------------------------------------------------------Balance at December 31, 2012 29.7 148.6 738.3 589.8----------------------------------------------------------------------------Accumulated Depreciation and Impairment----------------------------------------------------------------------------Balance at December 31, 2011 - 38.6 308.2 285.7----------------------------------------------------------------------------Balance at December 31, 2012 - 43.4 346.3 306.0--------------------------------------------------------------------------------------------------------------------------------------------------------Carrying Amount----------------------------------------------------------------------------Balance at December 31, 2011 29.7 108.5 420.2 305.7----------------------------------------------------------------------------Balance at December 31, 2012 29.7 105.2 392.0 283.8------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Construction Products Distribution Leasehold Equipment Improvements Total----------------------------------------------------------------------------Cost----------------------------------------------------------------------------Balance at December 31, 2011 41.2 9.9 1,547.7----------------------------------------------------------------------------Balance at December 31, 2012 43.3 9.7 1,559.4----------------------------------------------------------------------------Accumulated Depreciation and Impairment----------------------------------------------------------------------------Balance at December 31, 2011 22.4 7.8 662.7----------------------------------------------------------------------------Balance at December 31, 2012 25.6 8.2 729.5--------------------------------------------------------------------------------------------------------------------------------------------------------Carrying Amount----------------------------------------------------------------------------Balance at December 31, 2011 18.8 2.1 885.0----------------------------------------------------------------------------Balance at December 31, 2012 17.7 1.5 829.9--------------------------------------------------------------------------------------------------------------------------------------------------------
