Pension Plans and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Curtailment gain			$ 0.0	$ 0.1
United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.6	$ 2.0	4.8	6.0
Interest cost	1.4	1.4	4.3	4.2
Expected return on plan assets	(1.6)	(1.9)	(4.8)	(5.7)
Mark-to-market adjustment			0.0	0.0
Gain on curtailments, settlements, and terminations			0.0	0.0
Net periodic benefit cost (income)	1.4	1.5	4.3	4.5
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.7	0.8	2.0	2.4
Interest cost	1.4	1.4	4.1	4.2
Expected return on plan assets	(1.5)	(1.7)	(4.5)	(5.3)
Mark-to-market adjustment			0.0	(0.3)
Gain on curtailments, settlements, and terminations			0.0	(0.1)
Net periodic benefit cost (income)	0.6	$ 0.5	1.6	$ 0.9
Discontinued operations
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Curtailment gain	$ 0.0		$ 0.2