Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	$ 1.0	$ (80.8)	$ 38.2	$ (99.5)
Tax	0.4	(0.5)	0.2	(0.7)
Other comprehensive income (loss)	1.4	(81.3)	38.4	(100.2)
Cumulative translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	2.3	(81.9)	38.9	(101.4)
Tax	0.0	0.0	0.0	0.0
Other comprehensive income (loss)	2.3	(81.9)	38.9	(101.4)
Pension and other postretirement adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	(1.3)	1.1	(0.7)	1.9
Tax	0.4	(0.5)	0.2	(0.7)
Other comprehensive income (loss)	$ (0.9)	$ 0.6	$ (0.5)	$ 1.2