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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost			$ 0.1
Curtailment gain			0.0	$ 0.1
United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.7	$ 2.0	3.2	4.0
Interest cost	1.5	1.4	2.9	2.8
Expected return on plan assets	(1.6)	(1.9)	(3.2)	(3.8)
Mark-to-market adjustment	0.0	0.0	0.0	0.0
Gain on curtailments, settlements, and terminations	0.0	0.0	0.0	0.0
Net periodic benefit cost (income)	1.6	1.5	2.9	3.0
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.6	0.8	1.3	1.6
Interest cost	1.3	1.4	2.7	2.8
Expected return on plan assets	(1.5)	(1.8)	(3.0)	(3.6)
Mark-to-market adjustment	0.0	(0.3)	0.0	(0.3)
Gain on curtailments, settlements, and terminations	0.0	(0.1)	0.0	(0.1)
Net periodic benefit cost (income)	0.4	$ 0.0	1.0	$ 0.4
Discontinued operations
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Curtailment gain	$ 0.0		$ 0.2