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Stockholders' Equity (Changes in Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Stockholders' equity, beginning of period $ 3,443.8 $ 3,018.0 $ 2,907.0
Other comprehensive (loss) gain, net of reclassification adjustments (31.3) 39.5 (219.9)
Stockholders' equity, end of period 3,882.6 3,443.8 3,018.0
Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Stockholders' equity, beginning of period (1,770.9) (1,810.8) (1,595.2)
Other comprehensive loss before reclassifications (52.7) 30.0  
Net losses reclassified from accumulated other comprehensive loss 20.5 9.9  
Other comprehensive (loss) gain, net of reclassification adjustments (32.2) 39.9 (215.6)
Stockholders' equity, end of period (1,803.1) (1,770.9) (1,810.8)
Defined Benefit Pension Plans      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Stockholders' equity, beginning of period (230.4) (313.3) (296.4)
Other comprehensive loss before reclassifications (7.2) 70.0  
Net losses reclassified from accumulated other comprehensive loss 6.4 12.9  
Other comprehensive (loss) gain, net of reclassification adjustments (0.8) 82.9 (16.9)
Stockholders' equity, end of period (231.2) (230.4) (313.3)
Cumulative Translation Adjustment      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Stockholders' equity, beginning of period (1,540.1) (1,495.0) (1,297.5)
Other comprehensive loss before reclassifications (30.9) (45.1)  
Net losses reclassified from accumulated other comprehensive loss 0.0 0.0  
Other comprehensive (loss) gain, net of reclassification adjustments (30.9) (45.1) (197.5)
Stockholders' equity, end of period (1,571.0) (1,540.1) (1,495.0)
Deferred Net (Losses) Gains on Derivatives      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Stockholders' equity, beginning of period (0.4) (2.5) (1.3)
Other comprehensive loss before reclassifications (14.6) 5.1 5.1
Net losses reclassified from accumulated other comprehensive loss 14.1 (3.0) (6.3)
Other comprehensive (loss) gain, net of reclassification adjustments (0.5) 2.1 (1.2)
Stockholders' equity, end of period $ (0.9) $ (0.4) $ (2.5)