Postretirement Benefit Plans - Rollforward of the Projected Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Change in benefit obligation
Benefit obligation as of January 1	$ 149.8	$ 214.3
Service cost	1.1	1.8
Interest cost	6.1	3.5
Amendments	0.0	(8.1)
Actuarial loss (gain)(a)	0.8	(44.6)	[1]
Benefits paid	(9.1)	(11.1)
Settlement	(0.4)	0.0
Foreign currency translation	2.3	(6.0)
Benefit obligation as of December 31	150.6	149.8		$ 214.3
Pension Plan [Member]
Change in benefit obligation
Benefit obligation as of January 1	79.1
Service cost	0.8	1.2		1.4
Interest cost	3.0	1.3		1.0
Benefit obligation as of December 31	84.4	79.1
Other Postretirement Benefits Plan [Member]
Change in benefit obligation
Benefit obligation as of January 1	70.7	106.4
Service cost	0.3	0.6		0.7
Interest cost	3.1	2.2		1.8
Amendments	0.0	(8.1)
Actuarial loss (gain)(a)	(2.9)	(23.3)	[1]
Benefits paid	(5.0)	(7.1)
Settlement	0.0	0.0
Foreign currency translation	0.0	0.0
Benefit obligation as of December 31	66.2	70.7		106.4
United States | Pension Plan [Member]
Change in benefit obligation
Benefit obligation as of January 1	11.2	14.8
Service cost	0.0	0.0		0.0
Interest cost	0.6	0.3		0.3
Amendments	0.0	0.0
Actuarial loss (gain)(a)	0.3	(3.0)	[1]
Benefits paid	(0.9)	(0.9)
Settlement	0.0	0.0
Foreign currency translation	0.0	0.0
Benefit obligation as of December 31	11.2	11.2		14.8
International Plan [Member] | Pension Plan [Member]
Change in benefit obligation
Benefit obligation as of January 1	67.9	93.1
Service cost	0.8	1.2		1.4
Interest cost	2.4	1.0		0.7
Amendments	0.0	0.0
Actuarial loss (gain)(a)	3.4	(18.3)	[1]
Benefits paid	(3.2)	(3.1)
Settlement	(0.4)	0.0
Foreign currency translation	2.3	(6.0)
Benefit obligation as of December 31	$ 73.2	$ 67.9		$ 93.1

[1] The actuarial gain in 2022 is primarily due to an increase in discount rates during the year.