Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
U.S. Pension Plans
Components of periodic benefit costs
Interest cost of projected benefit obligations	$ 1.3	$ 1.3
Expected return on plan assets	(1.5)	(1.2)
Amortization of actuarial net loss	0.8	0.8
Net periodic benefit costs	0.6	0.9
Non-U.S. Pension Plans
Components of periodic benefit costs
Service cost - benefits earned during the period	0.5	0.4
Interest cost of projected benefit obligations	0.5	0.6
Expected return on plan assets	(0.4)	(0.4)
Amortization of actuarial net loss	0.4	0.4
Net periodic benefit costs	1.0	1.0
Postretirement Health and Other Plans
Components of periodic benefit costs
Service cost - benefits earned during the period	0.1	0.1
Interest cost of projected benefit obligations	0.2	0.2
Amortization of prior service cost	(0.7)	(0.3)
Amortization of actuarial net loss	0.2	0.1
Net periodic benefit costs	$ (0.2)	$ 0.1