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Stockholders' Equity (Changes in Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Stockholders' equity, beginning of period $ 3,018.0 $ 2,907.0 $ 2,993.5
Net losses (gains) reclassified from accumulated other comprehensive income (loss) 9.9 8.9  
Other comprehensive gain (loss), net of reclassification adjustments 39.5 (219.9) (37.3)
Stockholders' equity, end of period 3,443.8 3,018.0 2,907.0
Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Stockholders' equity, beginning of period (1,810.8) (1,595.2) (1,555.4)
Other comprehensive income (loss) before reclassifications 30.0 (224.5)  
Net losses (gains) reclassified from accumulated other comprehensive income (loss) 9.9 8.9  
Other comprehensive gain (loss), net of reclassification adjustments 39.9 (215.6) (39.8)
Stockholders' equity, end of period (1,770.9) (1,810.8) (1,595.2)
Defined Benefit Pension Plans      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Stockholders' equity, beginning of period (313.3) (296.4) (282.4)
Other comprehensive income (loss) before reclassifications 70.0 (32.1)  
Net losses (gains) reclassified from accumulated other comprehensive income (loss) 12.9 15.2  
Other comprehensive gain (loss), net of reclassification adjustments 82.9 (16.9) (14.0)
Stockholders' equity, end of period (230.4) (313.3) (296.4)
Cumulative Translation Adjustment      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Stockholders' equity, beginning of period (1,495.0) (1,297.5) (1,274.4)
Other comprehensive income (loss) before reclassifications (45.1) (197.5)  
Net losses (gains) reclassified from accumulated other comprehensive income (loss) 0.0 0.0  
Other comprehensive gain (loss), net of reclassification adjustments (45.1) (197.5) (23.1)
Stockholders' equity, end of period (1,540.1) (1,495.0) (1,297.5)
Deferred Net Gains (Losses) on Derivatives      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Stockholders' equity, beginning of period (2.5) (1.3) 1.4
Other comprehensive income (loss) before reclassifications 5.1 5.1 (2.6)
Net losses (gains) reclassified from accumulated other comprehensive income (loss) (3.0) (6.3) (0.1)
Other comprehensive gain (loss), net of reclassification adjustments 2.1 (1.2) (2.7)
Stockholders' equity, end of period $ (0.4) $ (2.5) $ (1.3)