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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net sales $ 479.7 $ 507.4 $ 567.0 $ 531.1 $ 453.9 $ 462.1 $ 421.1 $ 354.1 $ 2,085.2 $ 1,691.2 $ 1,328.7
Net income (loss)                 177.1 28.8 (181.3)
Current assets 1,034.2       980.7       1,034.2 980.7  
Total assets 2,493.3       2,331.0       2,493.3 2,331.0  
Equity 1,226.3       1,033.8       1,226.3 1,033.8  
Total liabilities and stockholders' equity 2,493.3       2,331.0       2,493.3 2,331.0  
Equity Method Investee [Member]
                      
Net sales                 230.5 238.9 188.6
Net income (loss)                 23.8 3.4 (53.7)
Current assets 15.2       54.5       15.2 54.5  
Long term assets 1.2       146.8       1.2 146.8  
Total assets 16.4       201.3       16.4 201.3  
Total liabilities 10.0       41.4       10.0 41.4  
Equity 6.4       159.9       6.4 159.9  
Total liabilities and stockholders' equity $ 16.4       $ 201.3       $ 16.4 $ 201.3