Pension and Other Benefits - Schedule of Net Pension and Other Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.1	$ 0.1
Interest cost	8.3	8.7
Expected return on plan assets	(7.7)	(7.0)
Amortization of prior service cost	0.1	0.1
Amortization of actuarial losses (gains)	3.1	2.6
NET PERIODIC BENEFIT COST	3.9	4.5
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0
Interest cost	0.2	0.2
Expected return on plan assets	0.0	0.0
Amortization of prior service cost	0.0	0.0
Amortization of actuarial losses (gains)	(0.1)	(0.1)
NET PERIODIC BENEFIT COST	$ 0.1	$ 0.1