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Changes in Stockholders' Equity (Changes in Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance beginning of period $ 3,124.7 $ 2,690.6 $ 3,018.0 $ 2,907.0
Other comprehensive income (loss), net of reclassification adjustments 80.4 (31.3) 72.9 (233.2)
Balance end of period 3,164.8 2,717.5 3,164.8 2,717.5
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance beginning of period     (313.3)  
Other comprehensive income (loss) before reclassifications     23.2  
Net losses reclassified from accumulated other comprehensive loss     5.9  
Other comprehensive income (loss), net of reclassification adjustments     29.1  
Balance end of period (284.2)   (284.2)  
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     6.1  
Net losses reclassified from accumulated other comprehensive loss     4.2  
Other comprehensive income (loss), net of reclassification adjustments     10.3  
Balance end of period 7.8   7.8  
Cumulative Translation Adjustment        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance beginning of period     (1,495.0)  
Other comprehensive income (loss) before reclassifications     33.1  
Net losses reclassified from accumulated other comprehensive loss     0.0  
Other comprehensive income (loss), net of reclassification adjustments     33.1  
Balance end of period (1,461.9)   (1,461.9)  
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance beginning of period (1,817.9) (1,791.4) (1,810.8) (1,595.2)
Other comprehensive income (loss) before reclassifications     62.4  
Net losses reclassified from accumulated other comprehensive loss     10.1  
Other comprehensive income (loss), net of reclassification adjustments     72.5  
Balance end of period $ (1,738.3) $ (1,825.2) $ (1,738.3) $ (1,825.2)