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Retirement and Deferred Compensation Plans - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
United States Plans    
Defined Benefit Plan Disclosure [Line Items]    
Net loss $ 13.9 $ 13.0
Prior service cost 0.0 0.0
Total 13.9 13.0
Non-United States Plans    
Defined Benefit Plan Disclosure [Line Items]    
Net loss 29.9 32.7
Prior service cost 6.7 4.7
Total $ 36.6 $ 37.4