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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended
Jun. 15, 2015
Apr. 28, 2015
Jun. 16, 2014
Apr. 29, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Equity [Abstract]              
Dividend declaration date         Apr. 28, 2015 Apr. 29, 2014  
Dividend declared (in dollars per share)   $ 0.80   $ 0.49      
Dividend paid (in dollars per share) $ 0.80   $ 0.49        
Dividends payable, date paid         Jun. 15, 2015 Jun. 16, 2014  
Dividends payable, date of record         Jun. 01, 2015 Jun. 02, 2014  
Number of shares authorized to be repurchased (shares)         8,000,000    
Stock repurchased during period, including unsettled shares         2,200,000    
Repurchases of common stock, including unsettled shares         $ 187.2    
Stock repurchased during period (shares)         2,000,000    
Repurchases of common stock         $ (168.7) $ (16.7)  
Stock repurchased but not settled         200,000    
Repurchases of common stock, unsettled shares         $ 18.5    
Remaining authorized repurchase amount (shares)         4,000,000    
Remaining authorized repurchase amount, net of unsettled shares         3,800,000    
Components of Accumulated Other Comprehensive Income [Abstract]              
Foreign currency translation         $ (130.6)   $ (26.4)
Translation loss on net investment hedge, net of income taxes of $(4.6) and $(16.4), respectively         (3.6)   (24.5)
Translation loss on long-term intercompany loans         (52.3)   (73.4)
Unrealized gain on investments, net of income taxes of $3.4 and $3.7, respectively         15.1   16.7
Accumulated other comprehensive loss         (217.7)   (155.2)
Translation gain (loss) on net investment hedge, tax         (4.6)   (16.4)
Unrealized gain on investments, tax         3.4   3.7
Defined Benefit Pension Plans [Member]              
Components of Accumulated Other Comprehensive Income [Abstract]              
Defined benefit plans, net of income taxes         (50.6)   (52.1)
Defined benefit plans, tax         (29.5)   (30.1)
Retiree Health Care Plan [Member]              
Components of Accumulated Other Comprehensive Income [Abstract]              
Defined benefit plans, net of income taxes         4.3   4.5
Defined benefit plans, tax         $ 2.3   $ 2.4