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Investments in and Advances to Affiliates Results for affiliates (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Due to affiliates $ 0.4us-gaap_DueToRelatedPartiesCurrent               $ 0.4us-gaap_DueToRelatedPartiesCurrent    
Net sales 453.5us-gaap_SalesRevenueNet 518.1us-gaap_SalesRevenueNet 518.5us-gaap_SalesRevenueNet 444.7us-gaap_SalesRevenueNet 479.7us-gaap_SalesRevenueNet 507.4us-gaap_SalesRevenueNet 567.0us-gaap_SalesRevenueNet 531.1us-gaap_SalesRevenueNet 1,934.8us-gaap_SalesRevenueNet 2,085.2us-gaap_SalesRevenueNet 1,691.2us-gaap_SalesRevenueNet
Net income (loss)                 (75.4)us-gaap_NetIncomeLoss 177.1us-gaap_NetIncomeLoss 28.8us-gaap_NetIncomeLoss
Equity Method Investee [Member]                      
Net sales                     238.9us-gaap_SalesRevenueNet
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= us-gaap_EquityMethodInvesteeMember
Net income (loss)                     $ 3.4us-gaap_NetIncomeLoss
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= us-gaap_EquityMethodInvesteeMember