Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 377.0	$ 247.8
Balance	341.4	319.6
Pension and Other Postretirement Benefits Plans Cost
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(64.4)	(67.6)
Other comprehensive loss before reclassifications	0.0	0.0
Amounts reclassified from accumulated other comprehensive loss	1.3	1.4
Net change in accumulated other comprehensive loss	1.3	1.4
Balance	(63.1)	(66.2)
Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(13.9)	(13.2)
Other comprehensive loss before reclassifications	(0.4)	0.9
Amounts reclassified from accumulated other comprehensive loss	0.0	(0.4)
Net change in accumulated other comprehensive loss	(0.4)	0.5
Balance	(14.3)	(12.7)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(78.3)	(80.8)
Other comprehensive loss before reclassifications	(0.4)	0.9
Amounts reclassified from accumulated other comprehensive loss	1.3	1.0
Net change in accumulated other comprehensive loss	0.9	1.9
Balance	$ (77.4)	$ (78.9)