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Retirement Plans (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
plan
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Contributory defined benefit pension plans | plan 5    
United States Retirement Plans of US Entity, Defined Contribution [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, cost recognized $ 28.8 $ 27.8 $ 23.4
Foreign Retirement Plans, Defined Contribution [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, cost recognized 30.7 25.5 $ 27.2
Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 384.3 408.9  
Defined Benefit Plan, Funded (Unfunded) Status of Plan 18.7 6.7  
Change in benefit obligation ($ in millions):      
Projected benefit obligations, benefit obligation, end of year 365.6 402.2  
Change in plan assets:      
Defined Benefit Plan, Accumulated Benefit Obligation 365.6 402.2  
Foreign Plan [Member]      
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Assets for Plan Benefits, Defined Benefit Plan 25.2 22.4  
Pension assets (included in Other assets) (6.5) (15.7)  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax $ 84.7 $ 92.2