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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties    
Opening balance at January 1, 2013 $ 12.8  
Additions for tax positions of prior periods 0.2  
Reductions due to lapsed statutes of limitations (0.6)  
Closing balance at March 31, 2013 12.4  
Current (2.4) (3.0)
Non-current 10.0 9.8
Interest and Penalties [Member]
    
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties    
Opening balance at January 1, 2013 0.6  
Additions for tax positions of prior periods 0.1  
Reductions due to lapsed statutes of limitations (0.1)  
Closing balance at March 31, 2013 0.6  
Current (0.1)  
Non-current 0.5  
Unrecognized Tax Benefits [Member]
    
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties    
Opening balance at January 1, 2013 12.2  
Additions for tax positions of prior periods 0.1  
Reductions due to lapsed statutes of limitations (0.5)  
Closing balance at March 31, 2013 11.8  
Current (2.3)  
Non-current $ 9.5