Significant Accounting Policies - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Loss to Net Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Settlement gain	$ 5.5	$ (5.9)	$ (7.2)
Provision for income taxes	63.9	48.1	42.6
Net income	198.0	$ 160.2	$ 112.7
Reclassification out of Accumulated Other Comprehensive Income | Pension and Other Postretirement Benefit Obligations
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Settlement gain	(10.0)
Provision for income taxes	2.0
Net income	$ (8.0)