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Income Taxes (Details 5) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of beginning and ending amount of unrecognized tax benefits      
Balance at the beginning of the period $ 21.2 $ 24.6 $ 21.9
Additions based on current year tax positions 5.9 4.8 7.0
Additions based on prior years' tax positions 5.2    
Reductions for prior years' tax provisions (5.4)   (1.2)
Settlements   (1.2)  
Reductions related to lapses of statutes of limitations (4.6) (6.7) (3.4)
Additions (reductions) related to foreign exchange rates 0.3 (0.3) 0.3
Balance at the end of the period $ 22.6 $ 21.2 $ 24.6