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Income Taxes (Details 6) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Change to gross unrecognized tax benefits including interest and penalties $ (20.7) $ (10.4) $ 11.6
Reserve released due to favorable audit 9.4 11.6  
Uncertain tax liabilities interest and penalties (9.3) (1.4) 0.5
Uncertain tax liabilities interest and penalties accrued 12.8 22.1  
Unrecognized tax benefits and income tax expense possibly reduced from audit resolutions 14.5    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of year 47.3 56.3 45.2
Additions based on tax positions related to the current year 2.0 1.8 1.7
Additions for tax positions of prior years 3.7 3.6 17.1
Reductions for tax positions of prior years (0.2) 0 (1.7)
Reductions based on settlements with taxing authorities (11.5) (13.0) (5.4)
Reductions for lapse of statute (5.4) (1.4) (0.6)
Balance at end of year $ 35.9 $ 47.3 $ 56.3