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Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 5,610.0 $ 5,204.7 $ 3,734.5 $ 3,378.2
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent 9.2 14.6 (3.1)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent 59.8 43.0 (118.2)  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (81.2) (72.0) (57.4)  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (12.3) (18.0)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 3.1 3.4    
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent (9.2) (14.6)    
Reclassification from AOCI, Current Period, Tax 0.7 0.7    
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 3.2 4.5    
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (296.0) (355.8) (398.8)  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 59.8 43.0    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.0 0.0    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent 59.8 43.0    
Reclassification from AOCI, Current Period, Tax 0.0 0.0    
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 0.0 0.0    
AOCI Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (377.2) (427.8) (456.2) $ (341.1)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 47.5 25.0    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 3.1 3.4    
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent 9.2 14.6 (3.1)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent 59.8 43.0 $ (118.2)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 50.6 28.4    
Reclassification from AOCI, Current Period, Tax 0.7 0.7    
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent $ 3.2 $ 4.5