Pension and Other Benefits - Net Pension and Other Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
NET PERIODIC BENEFIT COST	$ 4.4	$ 0.0	$ 4.4	$ 0.0
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.2	0.3	0.4	0.5
Interest cost	6.3	6.0	12.6	12.0
Expected return on plan assets	(8.2)	(9.2)	(16.4)	(18.3)
Amortization of prior service cost	0.1	0.1	0.2	0.1
Amortization of actuarial losses (gains)	2.6	2.7	5.2	5.4
Settlement losses	5.8	0.0	5.8	0.0
NET PERIODIC BENEFIT COST	6.8	(0.1)	7.8	(0.3)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0	0.0	0.0
Interest cost	0.1	0.2	0.2	0.3
Expected return on plan assets	0.0	0.0	0.0	0.0
Amortization of prior service cost	0.0	0.0	0.0	0.0
Amortization of actuarial losses (gains)	(0.1)	0.0	(0.2)	0.0
Settlement losses	0.0	0.0	0.0	0.0
NET PERIODIC BENEFIT COST	$ 0.0	$ 0.2	$ 0.0	$ 0.3