Pension Plans and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.6	$ 1.7	$ 3.1	$ 3.2
Interest cost	1.2	1.5	2.5	2.9
Expected return on plan assets	(1.7)	(1.6)	(3.3)	(3.2)
Amortization of prior service cost	0.0	0.0	0.0	0.0
Net periodic benefit cost (income)	1.1	1.6	2.3	2.9
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.2	0.6	0.4	1.3
Interest cost	1.0	1.3	2.1	2.7
Expected return on plan assets	(1.1)	(1.5)	(2.3)	(3.0)
Amortization of prior service cost	0.1	0.0	0.1	0.0
Net periodic benefit cost (income)	$ 0.2	$ 0.4	$ 0.3	$ 1.0