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Pensions - Schedule of Net Periodic Pension Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]        
Pension settlement charges $ 6.1 $ 0.0 $ 6.1 $ 0.0
U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost   0.0 0.0 0.0
Interest cost   6.4 7.6 7.8
Expected return on plan assets   (8.7) (9.6) (10.3)
Amortization of actuarial loss   3.0 2.5 5.6
Pension settlement charges   0.0 6.1 0.0
Net periodic pension expense   0.7 6.6 3.1
Non-U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost   0.2 0.2 0.2
Interest cost   1.3 1.4 1.8
Expected return on plan assets   (2.2) (2.1) (2.4)
Amortization of actuarial loss   0.6 0.6 0.6
Pension settlement charges   0.0 0.0 0.0
Net periodic pension expense   $ (0.1) $ 0.1 $ 0.2