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Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accumulated other comprehensive loss, net of tax [Abstract]      
Foreign currency translation $ 10.2 $ 22.0  
Unrealized gains (losses) on securities of affiliates 0.4 0.1 (0.5)
Unrealized losses on derivatives (5.4) (3.7)  
Defined benefit pension and other postretirement plans (76.7) (49.7)  
Accumulated other comprehensive loss $ (71.5) $ (31.3)