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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties    
Opening balance at January 1, 2012 $ 12.6  
Additions for tax positions of prior periods 0.1  
Reductions for tax positions of prior periods (0.2)  
Closing balance at September 30, 2012 12.5  
Current (3.0) (3.2)
Non-current 9.5 9.4
Interest and Penalties [Member]
    
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties    
Opening balance at January 1, 2012 0.4  
Additions for tax positions of prior periods 0.1  
Reductions for tax positions of prior periods 0  
Closing balance at September 30, 2012 0.5  
Current (0.3)  
Non-current 0.2  
Unrecognized Tax Benefits [Member]
    
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties    
Opening balance at January 1, 2012 12.2  
Additions for tax positions of prior periods 0  
Reductions for tax positions of prior periods (0.2)  
Closing balance at September 30, 2012 12.0  
Current (2.7)  
Non-current $ 9.3