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Changes in Stockholders' Equity (Changes in Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning of period $ 3,095.3  
Net losses reclassified from accumulated other comprehensive loss 4.3 $ 4.2
Other comprehensive income, net of reclassification adjustments 11.9 48.9
Balance end of period 3,119.4  
Defined Benefit Pension Plans [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning of period (285.1)  
Other comprehensive (loss) income before reclassifications 0.0  
Net losses reclassified from accumulated other comprehensive loss 3.1 $ 2.9
Other comprehensive income, net of reclassification adjustments 3.1  
Balance end of period (282.0)  
Deferred Net (Losses) Gains on Derivatives [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning of period (4.7)  
Other comprehensive (loss) income before reclassifications (2.1)  
Net losses reclassified from accumulated other comprehensive loss 1.2  
Other comprehensive income, net of reclassification adjustments (0.9)  
Balance end of period (5.6)  
Cumulative Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning of period (1,071.8)  
Other comprehensive (loss) income before reclassifications 9.6  
Net losses reclassified from accumulated other comprehensive loss 0.0  
Other comprehensive income, net of reclassification adjustments 9.6  
Balance end of period (1,062.2)  
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning of period (1,361.6)  
Other comprehensive (loss) income before reclassifications 7.5  
Net losses reclassified from accumulated other comprehensive loss 4.3  
Other comprehensive income, net of reclassification adjustments 11.8  
Balance end of period $ (1,349.8)