Pension and Other Postretirement Benefits - Components of Defined Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in plan assets
Company contributions	$ 2.4	$ 4.5
Amount recognized in the consolidated balance sheets:
Pension asset	30.7	22.4
Pensions
Change in projected benefit obligation
Projected benefit obligation at January 1	1,044.3	1,354.0
Service cost	2.6	3.6	$ 4.7
Interest cost	50.4	29.3	24.5
Actuarial loss (gain)	19.0	(256.2)
Foreign currency exchange rate changes and other	0.0	(0.5)
Plan participants’ contributions	0.0	0.0
Settlements	(1.0)	(2.2)
Benefits paid	(83.1)	(83.7)
Projected benefit obligation at December 31	1,032.2	1,044.3	1,354.0
Change in plan assets
Fair value of plan assets at January 1	1,044.1	1,372.0
Actual return on plan assets	79.2	(245.3)
Foreign currency exchange rate changes	0.3	3.1
Company contributions	1.2	3.5
Plan participants’ contributions	0.0	0.0
Settlements	(0.4)	(5.5)
Benefits paid	(83.1)	(83.7)
Fair value of plan assets at December 31	1,041.3	1,044.1	1,372.0
Funded Status
Net funded status of the plan (liability)	9.1	(0.2)
Amount recognized in the consolidated balance sheets:
Pension asset	30.7	22.4
Accrued benefit liability	(21.6)	(22.6)
Total	9.1	(0.2)
Pensions | Non-U.S.
Change in plan assets
Company contributions	0.1	0.1
U.S. plans with assets | UNITED STATES
Funded Status
Net funded status of the plan (liability)	30.7	22.4
U.S. plans with assets | Non-U.S.
Funded Status
Net funded status of the plan (liability)	(1.6)	(1.2)
U.S. plans without assets | UNITED STATES
Funded Status
Net funded status of the plan (liability)	(14.7)	(14.6)
Other Benefits
Change in projected benefit obligation
Projected benefit obligation at January 1	11.2	13.7
Service cost	0.0	0.0	0.0
Interest cost	0.5	0.3	0.3
Actuarial loss (gain)	(1.4)	(1.7)
Foreign currency exchange rate changes and other	0.0	0.0
Plan participants’ contributions	0.3	0.3
Settlements	0.0	0.0
Benefits paid	(1.4)	(1.4)
Projected benefit obligation at December 31	9.2	11.2	13.7
Change in plan assets
Fair value of plan assets at January 1	(0.1)	0.0
Actual return on plan assets	0.0	0.0
Foreign currency exchange rate changes	0.0	0.0
Company contributions	1.2	1.0
Plan participants’ contributions	0.3	0.3
Settlements	0.0	0.0
Benefits paid	(1.4)	(1.4)
Fair value of plan assets at December 31	0.0	(0.1)	$ 0.0
Funded Status
Net funded status of the plan (liability)	(9.2)	(11.3)
Amount recognized in the consolidated balance sheets:
Pension asset	0.0	0.0
Accrued benefit liability	(9.2)	(11.3)
Total	(9.2)	(11.3)
U.S. plans with assets | UNITED STATES
Funded Status
Net funded status of the plan (liability)	0.0	0.0
U.S. plans with assets | Non-U.S.
Funded Status
Net funded status of the plan (liability)	0.0	0.0
U.S. plans without assets | UNITED STATES
Funded Status
Net funded status of the plan (liability)	(9.2)	(11.3)
All other plans
Funded Status
Net funded status of the plan (liability)	(5.3)	(6.8)
All other plans
Funded Status
Net funded status of the plan (liability)	$ 0.0	$ 0.0