Retirement Plans - Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 0.1	$ 0.1
Prior service cost (credit)	(0.2)	(0.2)
Total benefit cost	(0.1)	(0.1)
Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	3.6	4.1
Interest cost	4.7	4.8
Expected return on assets	(4.8)	(4.7)
Net loss (gain)	0.1	(0.4)
Prior service cost (credit)	0.1	0.2
Total benefit cost	$ 3.7	$ 4.0