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Retirement and Deferred Compensation Plans - Defined Contribution Plans and Deferred Compensation Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Deferred compensation plans, asset and liability $ 98.0 $ 85.7  
Other Pension Plan, Postretirement or Supplemental Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Funded status, end of year (61.8) (56.8)  
Non-United States Plans      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax (29.9) (32.7)  
Funded status, end of year (112.8) (91.5)  
Statutory Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total expense 35.6 24.0 $ 24.7
Company Sponsored Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total expense $ 17.6 $ 21.4 $ 19.6