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Employee Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2022

Retirement Benefits [Abstract]

Schedule of Changes in Projected Benefit Obligation, Changes in Plan Assets and Funded Status of Plan

The following table provides a reconciliation of benefit obligations and plan assets of the Company’s pension plans and postretirement benefit plans (in millions):

			Pension												Postretirement
			2022						2021						2022						2021
Change in Projected Benefit Obligations
Benefit obligations at beginning of year			$	168.4					$	176.8					$	1.0					$	1.1
Interest cost			4.5						4.1						0.1						—
Plan settlements			(10.8)						(5.9)						—						—
Benefits paid			(0.3)						(0.3)						—						—
Actuarial gain			(27.5)						(6.3)						(0.3)						(0.1)
Benefit obligations at end of year			$	134.3					$	168.4					$	0.8					$	1.0
Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year			$	156.4					$	157.5					$	—					$	—
Actual return on plan assets			(32.4)						5.1						—						—
Plan settlements			(10.8)						(5.9)						—						—
Benefits paid			(0.3)						(0.3)						—						—
Fair value of plan assets at end of year			$	112.9					$	156.4					$	—					$	—
Funded Status			$	(21.4)					$	(12.0)					$	(0.8)					$	(1.0)
Accumulated benefit obligations			$	134.3					$	168.4

Schedule of Amounts Recognized in Balance Sheet

			Pension												Postretirement
			2022						2021						2022						2021
Amounts Recognized in Balance Sheet
Accrued liabilities			$	(0.3)					$	(0.1)					$	(0.1)					$	(0.1)
Other long-term liabilities			(21.1)						(11.9)						(0.7)						(0.9)
Net amount recognized			$	(21.4)					$	(12.0)					$	(0.8)					$	(1.0)
Amounts Recognized in Accumulated Other Comprehensive Loss
Net actuarial gain (loss)			$	(24.0)					$	(15.7)					$	0.5					$	0.2
Prior service credits			—						—						(0.1)						—
Net amount recognized			$	(24.0)					$	(15.7)					$	0.4					$	0.2
Weighted‑Average Assumptions Used to Determine Projected Benefit Obligations
Discount rate			5.4		%				2.7		%				5.4		%				2.7		%
Average rate of increase in compensation			—		%				—		%				—		%				—		%
Interest credit rate			3.8		%				3.8		%				—		%				—		%
Initial healthcare cost trend rate			N/A						N/A						6.1		%				5.6		%
Ultimate healthcare cost trend rate			N/A						N/A						4.0		%				4.0		%

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)

			Pension												Postretirement
			2022						2021						2022						2021
Amounts Recognized in Balance Sheet
Accrued liabilities			$	(0.3)					$	(0.1)					$	(0.1)					$	(0.1)
Other long-term liabilities			(21.1)						(11.9)						(0.7)						(0.9)
Net amount recognized			$	(21.4)					$	(12.0)					$	(0.8)					$	(1.0)
Amounts Recognized in Accumulated Other Comprehensive Loss
Net actuarial gain (loss)			$	(24.0)					$	(15.7)					$	0.5					$	0.2
Prior service credits			—						—						(0.1)						—
Net amount recognized			$	(24.0)					$	(15.7)					$	0.4					$	0.2
Weighted‑Average Assumptions Used to Determine Projected Benefit Obligations
Discount rate			5.4		%				2.7		%				5.4		%				2.7		%
Average rate of increase in compensation			—		%				—		%				—		%				—		%
Interest credit rate			3.8		%				3.8		%				—		%				—		%
Initial healthcare cost trend rate			N/A						N/A						6.1		%				5.6		%
Ultimate healthcare cost trend rate			N/A						N/A						4.0		%				4.0		%

Schedule of Assumptions Used

			Pension												Postretirement
			2022						2021						2022						2021
Amounts Recognized in Balance Sheet
Accrued liabilities			$	(0.3)					$	(0.1)					$	(0.1)					$	(0.1)
Other long-term liabilities			(21.1)						(11.9)						(0.7)						(0.9)
Net amount recognized			$	(21.4)					$	(12.0)					$	(0.8)					$	(1.0)
Amounts Recognized in Accumulated Other Comprehensive Loss
Net actuarial gain (loss)			$	(24.0)					$	(15.7)					$	0.5					$	0.2
Prior service credits			—						—						(0.1)						—
Net amount recognized			$	(24.0)					$	(15.7)					$	0.4					$	0.2
Weighted‑Average Assumptions Used to Determine Projected Benefit Obligations
Discount rate			5.4		%				2.7		%				5.4		%				2.7		%
Average rate of increase in compensation			—		%				—		%				—		%				—		%
Interest credit rate			3.8		%				3.8		%				—		%				—		%
Initial healthcare cost trend rate			N/A						N/A						6.1		%				5.6		%
Ultimate healthcare cost trend rate			N/A						N/A						4.0		%				4.0		%

Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets

The benefit obligations and fair value of plan assets for the Company’s qualified and non-qualified pension and postretirement plans with projected benefit obligations or accumulated benefit obligations in excess of plan assets are as follows (in millions):

			Pension												Postretirement
			2022						2021						2022						2021
Plans with Benefit Obligations in Excess of Plan Assets
Projected benefit obligations			$	134.3					$	168.4					$	0.8					$	1.0
Accumulated benefit obligations			134.3						168.4						—						—
Fair value of plan assets			112.9						156.4						—						—

Schedule of Net Periodic Costs

The following table sets forth the net periodic pension cost (benefit) (in millions):

			Years Ended December 31,
			2022						2021						2020
Components of Net Periodic Pension Cost (Benefit)
Interest cost			$	4.5					$	4.1					$	5.1
Expected return on plan assets			(5.4)						(6.5)						(6.1)
Net amortization of actuarial net loss			—						0.5						0.7
Settlement loss			1.9						0.6						1.0
Net periodic pension cost (benefit)			$	1.0					$	(1.3)					$	0.7
Weighted‑Average Assumptions Used to Determine Net Periodic Pension Cost (Benefit)
Discount rate			2.7		%				2.3		%				3.2		%
Expected return on assets			4.6		%				4.8		%				5.2		%
Average rate of increase in compensation			—		%				—		%				—		%
Interest credit rate			3.8		%				3.8		%				3.8		%

Schedule of Allocation of Plan Assets

The fair value measurements of most plan assets are based upon significant other observable inputs (Level 2), except for the high yield mutual fund and cash which are based upon quoted market prices in active markets for identical assets (Level 1). The following represents the Company's pension plan assets (in millions):

Asset Category			December 31, 2022						December 31, 2021
Cash			$	3.1					$	2.0
Short Term Investments			1.4						1.4
Equity Securities:
U.S. Large Cap			12.2						16.1
U.S. Mid Cap			1.8						2.7
U.S. Small Cap			0.2						1.2
International Developed			10.2						15.2
International Emerging Markets			3.4						3.9
Fixed Income Securities:
U.S. Treasuries			20.7						28.7
Corporate Bonds			36.0						53.0
Government Bonds			7.0						9.4
Municipal Bonds			2.2						3.3
Mortgage-Backed Securities			0.2						2.3
Asset-Backed Securities			1.1						1.1
Bank Loans			5.4						7.9
Preferreds			5.9						7.7
Other			2.1						0.5
Total fair value of pension plan assets			$	112.9					$	156.4

Schedule of Expected Benefit Payments

The following table presents estimated future benefit payments (in millions):

			Pension						Postretirement
2023			$	8.3					$	0.1
2024			9.3						0.1
2025			10.2						0.1
2026			11.7						0.1
2027			12.9						0.1
2028-2032			69.0						0.3
			$	121.4					$	0.8

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