Pensions and Postretirement Benefits - Summary of Change in Defined Benefit and Postretirement Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in plan assets
Fair value of plan assets at beginning of year	$ 169.9
Fair value of plan assets at end of year	131.5	$ 169.9
Funded (underfunded) status of the plans
Pension assets	63.9	86.2
Pension Benefits
Change in benefit obligation
Benefit obligation at beginning of year	83.7	86.5
Service costs	4.3	4.2	$ 4.1
Interest costs	1.8	1.4	2.1
Actuarial gains	(15.8)	(2.5)
Benefits and expenses paid	(6.4)	(5.9)
Benefit obligation at end of year	67.6	83.7	86.5
Change in plan assets
Fair value of plan assets at beginning of year	169.9	161.3
Actual return on plan assets	(32.0)	19.6
Company contributions	0.0	0.0
Cash transfer to fund postretirement benefit payments	0.0	(5.1)
Benefits and expenses paid	(6.4)	(5.9)
Fair value of plan assets at end of year	131.5	169.9	161.3
Funded (underfunded) status of the plans	63.9	86.2
Funded (underfunded) status of the plans
Pension assets	63.9	86.2
Other current liabilities	0.0	0.0
Other long-term liabilities	0.0	0.0
Asset, defined benefit plan	63.9	86.2
Amounts recognized in Accumulated other comprehensive loss
Net actuarial loss	39.9	10.8
Net prior service cost	0.1	0.2
Accumulated other comprehensive loss	40.0	11.0
Postretirement Benefits
Change in benefit obligation
Benefit obligation at beginning of year	6.9	7.9
Service costs	0.0	0.0	0.0
Interest costs	0.1	0.1	0.2
Actuarial gains	(0.8)	(0.5)
Benefits and expenses paid	(1.0)	(0.6)
Benefit obligation at end of year	5.2	6.9	7.9
Change in plan assets
Fair value of plan assets at beginning of year	4.5	0.0
Actual return on plan assets	0.1	0.0
Company contributions	0.0	5.1
Cash transfer to fund postretirement benefit payments	0.0	0.0
Benefits and expenses paid	(1.0)	(0.6)
Fair value of plan assets at end of year	3.6	4.5	$ 0.0
Funded (underfunded) status of the plans	(1.6)	(2.4)
Funded (underfunded) status of the plans
Pension assets	0.0	0.0
Other current liabilities	0.0	0.1
Other long-term liabilities	1.6	2.3
Liability, defined benefit plan	1.6	2.4
Amounts recognized in Accumulated other comprehensive loss
Net actuarial loss	2.4	2.2
Net prior service cost	0.0	0.0
Accumulated other comprehensive loss	$ 2.4	$ 2.2