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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties      
Opening balance at January 1 $ 12.6 $ 8.6 $ 19.4
Additions related to tax positions taken in the current period 0.2 5.2 0
Additions for tax positions of prior periods 0.2 0.7 2.1
Reductions for tax positions of prior periods   (1.9)  
Reductions due to lapsed statutes of limitations (0.2)    
Settlements     (12.9)
Closing balance at December 31 12.8 12.6 8.6
Current (3.0) (3.2) (2.2)
Non-current 9.8 9.4 6.4
Interest and Penalties [Member]
      
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties      
Opening balance at January 1 0.4 0.3 3.8
Additions related to tax positions taken in the current period 0 0 0
Additions for tax positions of prior periods 0.2 0.2 0.1
Reductions for tax positions of prior periods   (0.1)  
Reductions due to lapsed statutes of limitations 0    
Settlements     (3.6)
Closing balance at December 31 0.6 0.4 0.3
Current (0.3) (0.3) (0.2)
Non-current 0.3 0.1 0.1
Unrecognized Tax Benefits [Member]
      
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties      
Opening balance at January 1 12.2 8.3 15.6
Additions related to tax positions taken in the current period 0.2 5.2 0
Additions for tax positions of prior periods 0 0.5 2.0
Reductions for tax positions of prior periods   (1.8)  
Reductions due to lapsed statutes of limitations (0.2)    
Settlements     (9.3)
Closing balance at December 31 12.2 12.2 8.3
Current (2.7) (2.9) (2.0)
Non-current $ 9.5 $ 9.3 $ 6.3