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Changes in Stockholders' Equity (Changes in Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning of period $ 3,018.0 $ 2,907.0
Net losses reclassified from accumulated other comprehensive loss 7.6 3.4
Other comprehensive loss, net of reclassification adjustments (7.5) (201.9)
Balance end of period 3,124.7 2,690.6
Defined Benefit Pension Plans    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning of period (313.3)  
Other comprehensive income (loss) before reclassifications 31.2  
Net losses reclassified from accumulated other comprehensive loss 3.9 3.5
Other comprehensive loss, net of reclassification adjustments 35.1  
Balance end of period (278.2)  
Deferred Net Gains (Losses) on Derivatives    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning of period (2.5)  
Other comprehensive income (loss) before reclassifications 1.0  
Net losses reclassified from accumulated other comprehensive loss 3.7  
Other comprehensive loss, net of reclassification adjustments 4.7  
Balance end of period 2.2  
Cumulative Translation Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning of period (1,495.0)  
Other comprehensive income (loss) before reclassifications (46.9)  
Net losses reclassified from accumulated other comprehensive loss 0.0  
Other comprehensive loss, net of reclassification adjustments (46.9)  
Balance end of period (1,541.9)  
Accumulated Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning of period (1,810.8) (1,595.2)
Other comprehensive income (loss) before reclassifications (14.7)  
Net losses reclassified from accumulated other comprehensive loss 7.6  
Other comprehensive loss, net of reclassification adjustments (7.1)  
Balance end of period $ (1,817.9) $ (1,791.4)