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Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pension Plans | U.S. Pension Plans        
Components of periodic benefit costs        
Interest cost of projected benefit obligations $ 1.3 $ 1.3 $ 3.9 $ 4.0
Expected return on plan assets (1.5) (1.2) (4.5) (3.7)
Amortization of actuarial net loss 0.8 0.8 2.4 2.4
Pension settlement charge 4.5   4.5  
Net periodic benefit costs 5.1 0.9 6.3 2.7
Pension Plans | Non-U.S. Pension Plans        
Components of periodic benefit costs        
Service cost - benefits earned during the period 0.5 0.4 1.5 1.3
Interest cost of projected benefit obligations 0.5 0.6 1.5 1.6
Expected return on plan assets (0.4) (0.4) (1.2) (1.1)
Amortization of actuarial net loss 0.4 0.4 1.2 1.2
Net periodic benefit costs 1.0 1.0 3.0 3.0
Postretirement Health and Other Plans        
Components of periodic benefit costs        
Service cost - benefits earned during the period 0.1 0.1 0.3 0.2
Interest cost of projected benefit obligations 0.2 0.2 0.6 0.7
Amortization of prior service cost (0.7) (0.3) (2.1) (1.0)
Amortization of actuarial net loss 0.2 0.1 0.6 0.3
Net periodic benefit costs $ (0.2) $ 0.1 $ (0.6) $ 0.2