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Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 3,475.7   $ 3,378.2  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent 51.8 $ 61.2    
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (60.5) (68.7) (60.5) $ (68.7)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0.0 0.0    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax   0.0    
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent 0.0 0.0    
Reclassification from AOCI, Current Period, Tax 0.0 0.0    
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 0.0 0.0    
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (228.5) (421.1) (280.3) (482.3)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 51.8 61.2    
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 51.8 61.2    
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 (289.0) (489.8) $ (340.8) $ (551.0)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 51.8 61.2    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.0 0.0    
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent 0.0      
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 51.8 61.2    
Reclassification from AOCI, Current Period, Tax 0.0 0.0    
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent $ 0.0 $ 0.0