Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Pension Benefits | U.S. Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 1.6	$ 1.8	$ 5.0	$ 4.1
Interest cost	2.7	2.8	8.2	6.8
Expected return on plan assets	(3.0)	(4.0)	(9.2)	(9.5)
Recognition of:
Unrecognized prior service cost	0.0	0.0	0.0	0.0
Unrecognized net actuarial loss	0.0	0.0	0.0	0.0
Gain on settlement	(0.8)	0.0	(0.8)	0.0
Total recognized in other comprehensive (loss) income	0.5	0.6	3.2	1.4
Pension Benefits | Non-U.S. Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1.1	1.2	3.3	3.1
Interest cost	1.2	1.6	3.5	4.6
Expected return on plan assets	(3.1)	(2.8)	(9.2)	(8.2)
Recognition of:
Unrecognized prior service cost	0.0	0.0	0.1	0.1
Unrecognized net actuarial loss	1.2	0.8	3.7	2.2
Gain on settlement	0.0	0.0	0.0	0.0
Total recognized in other comprehensive (loss) income	0.4	0.8	1.4	1.8
Other Postretirement Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0.0	0.0	0.0	0.0
Interest cost	0.1	0.2	0.4	0.5
Expected return on plan assets	0.0	0.0	0.0	0.0
Recognition of:
Unrecognized prior service cost	(0.1)	0.0	(0.3)	0.0
Unrecognized net actuarial loss	0.1	0.0	0.1	0.0
Gain on settlement	0.0	0.0	0.0	0.0
Total recognized in other comprehensive (loss) income	$ 0.1	$ 0.2	$ 0.2	$ 0.5