Stockholders' Equity - Change in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (81.3)
Net current-period other comprehensive income (loss)	(7.7)	$ 2.7	$ (9.8)
Ending balance	(89.0)	(81.3)
Actuarial Losses
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(69.7)	(68.6)
Other comprehensive income (loss) before reclassifications	2.2	(2.8)
Amounts reclassified from accumulated other comprehensive loss	5.0	1.7
Net current-period other comprehensive income (loss)	7.2	(1.1)
Ending balance	(62.5)	(69.7)	(68.6)
Prior Service Costs
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2.0)	(2.0)
Other comprehensive income (loss) before reclassifications	0.1	(0.1)
Amounts reclassified from accumulated other comprehensive loss	0.1	0.1
Net current-period other comprehensive income (loss)	0.2	0.0
Ending balance	(1.8)	(2.0)	(2.0)
Foreign Currency Translation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(10.1)	(16.0)
Other comprehensive income (loss) before reclassifications	(14.4)	5.9
Amounts reclassified from accumulated other comprehensive loss	0.0	0.0
Net current-period other comprehensive income (loss)	(14.4)	5.9
Ending balance	(24.5)	(10.1)	(16.0)
Interest Rate Swaps
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0.5	2.6
Other comprehensive income (loss) before reclassifications	1.1	0.3
Amounts reclassified from accumulated other comprehensive loss	(1.8)	(2.4)
Net current-period other comprehensive income (loss)	(0.7)	(2.1)
Ending balance	(0.2)	0.5	2.6
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(81.3)	(84.0)
Other comprehensive income (loss) before reclassifications	(11.0)	3.3
Amounts reclassified from accumulated other comprehensive loss	3.3	(0.6)
Net current-period other comprehensive income (loss)	(7.7)	2.7	(9.8)
Ending balance	$ (89.0)	$ (81.3)	$ (84.0)

Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

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