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Retirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2022

Retirement Benefits [Abstract]

Schedule of Allocation of Plan Assets

Weighted-average asset allocations by asset category of the U.K. Pension Plan as of December 31, 2022 is as follows:

									Quoted Prices in Active Markets for Identical Assets						Significant Observable Inputs						Significant Unobservable Inputs
Asset category			Fair Value						(Level 1)						(Level 2)						(Level 3)
Investment account held by pension plan(a)			$	11.3					$	—					$	—					$	11.3
Total			$	11.3					$	—					$	—					$	11.3

(a)This category is comprised of investments in insurance contracts.

Weighted-average asset allocations by asset category of the U.K. Pension Plan as of December 31, 2021 is as follows:

									Quoted Prices in Active Markets for Identical Assets						Significant Observable Inputs						Significant Unobservable Inputs
Asset category			Fair Value						(Level 1)						(Level 2)						(Level 3)
Investment account held by pension plan(a)			$	12.9					—						—						$	12.9
Total			$	12.9					$	—					$	—					$	12.9

(a)This category is comprised of investments in insurance contracts.

Schedule of Rollforward Level 3 Investments

A reconciliation of the beginning and ending balances of the Level 3 investments of our U.K. Pension Plan during the years ended December 31 is as follows:

			2022						2021
Fair value at beginning of year			$	12.9					$	13.3
Purchases, sales, issuances and settlements, net			(0.3)						0.2
Net (loss) gain			0.1						(0.4)
Foreign currency			(1.4)						(0.2)
Fair value at end of year			$	11.3					$	12.9

Schedule of Weighted-Average Assumptions

Weighted-average assumptions used to determine benefit obligations as of December 31 are as follows:

			U.S. Nonqualified Plan												Non-U.S. Pension Benefits												Postretirement Medical Benefits
			2022						2021						2022						2021						2022						2021
Discount rate			5.37		%				2.54		%				1.05		%				1.59		%				5.37		%				2.53		%
Rate of compensation increase			—		%				—		%				2.25		%				—		%				—		%				—		%

Weighted-average assumptions used to determine net periodic benefit costs as of December 31 are as follows:

			U.S. Nonqualified Plan																		Non-U.S. Pension Benefits																		Postretirement Medical Benefits
			2022						2021						2020						2022						2021						2020						2022						2021						2020
Discount rate			2.54		%				2.06		%				3.01		%				1.55		%				1.05		%				1.42		%				2.53		%				2.07		%				3.06		%
Expected long-term rate of return on plan assets			—		%				—		%				—		%				3.20		%				2.70		%				3.30		%				—		%				—		%				—		%
Rate of compensation increase			—		%				—		%				—		%				1.50		%				—		%				—		%				—		%				—		%				—		%

Schedule of Accumulated Benefit Obligations

The accumulated benefit obligations as of December 31 for all defined benefit plans are as follows:

			2022						2021
U.S. Nonqualified Plan			$	0.9					$	1.1
U.K. Pension Plan			6.5						11.4
German Pension Plan			0.7						1.0
French Pension Plan			0.5						—
Italian Pension Plan			2.4						3.7

Information For Our Plans With An Accumulated Benefit Obligation In Excess Of Plan Assets

Information for our plans with an accumulated benefit obligation in excess of plan assets as of December 31 is as follows:

			2022						2021
Accumulated benefit obligation			$	4.5					$	5.8
Fair value of plan assets			—						—

Information For Our Plans With A Projected Benefit Obligation In Excess Of Plan Assets

Information for our plans with a projected benefit obligation in excess of plan assets as of December 31 is as follows:

			2022						2021
Projected benefit obligation			$	4.7					$	5.8
Fair value of plan assets			—						—

Schedule of Assumed Health Care Cost Trend Rates

Assumed healthcare cost trend rates as of December 31 are as follows:

			2022						2021
Healthcare cost trend rate assumption for the next year Pre-65			5.30		%				5.40		%
Healthcare cost trend rate assumption for the next year Post-65			5.80		%				5.90		%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)			4.00		%				4.00		%
Year that the rate reaches the ultimate trend rate			2045						2045

Schedule of Changes In Benefit Obligations and Plan Assets

Summaries related to changes in benefit obligations and plan assets and to the funded status of our defined benefit and postretirement medical benefit plans are as follows:

			U.S. Nonqualified Plan												Non-U.S. Pension Benefits												Postretirement Medical Benefits
			2022						2021						2022						2021						2022						2021
Change in benefit obligation:
Benefit obligation at beginning of year			$	1.1					$	1.2					$	16.2					$	17.6					$	7.0					$	7.3
Plan combinations			—						—						1.0						—						—						—
Service cost			—						—						0.3						—						—						0.1
Interest cost			—						0.1						0.2						0.2						0.2						0.1
Actuarial (gain) loss			(0.1)						—						(5.1)						(0.6)						(1.1)						0.6
Foreign exchange			—						—						(1.6)						(0.4)						—						—
Settlement			—						—						—						(0.3)						—						—
Benefits paid			(0.1)						(0.2)						(0.7)						(0.3)						(0.7)						(1.1)
Benefit obligation at end of year			$	0.9					$	1.1					$	10.3					$	16.2					$	5.4					$	7.0
Change in fair value of plan assets and net accrued liabilities:
Fair value of plan assets at beginning of year			$	—					$	—					$	12.9					$	13.3					$	—					$	—
Actual return on plan assets			—						—						0.1						(0.4)						—						—
Employer contributions			0.1						0.1						0.4						0.8						0.7						1.0
Foreign exchange			—						—						(1.4)						(0.2)						—						—
Settlement			—						—						—						(0.3)						—						—
Benefits paid			(0.1)						(0.1)						(0.7)						(0.3)						(0.7)						(1.0)
Fair value of plan assets at end of year			—						—						11.3						12.9						—						—
Funded status at end of year			$	(0.9)					$	(1.1)					$	1.0					$	(3.3)					$	(5.4)					$	(7.0)
Amounts recognized in the consolidated balance sheets consist of:
Noncurrent other assets			$	—					$	—					$	4.8					$	1.4					$	—					$	—
Current liabilities			(0.1)						(0.1)						(0.2)						(0.2)						(0.7)						(0.7)
Long-term liabilities			(0.8)						(1.0)						(3.6)						(4.5)						(4.7)						(6.3)
Net accrued liability			$	(0.9)					$	(1.1)					$	1.0					$	(3.3)					$	(5.4)					$	(7.0)
Amounts recognized in accumulated other comprehensive loss consist of:
Prior service cost			$	—					$	—					$	(0.1)					$	(0.2)					$	—					$	—
Net actuarial (loss) gain			(0.7)						(0.9)						2.8						(2.1)						1.3						0.2
Accumulated other comprehensive (loss) income			$	(0.7)					$	(0.9)					$	2.7					$	(2.3)					$	1.3					$	0.2

Schedule of Net Benefit Costs

The components of the net periodic benefit cost (credit) for the three years ended December 31 were as follows:

			U.S. Nonqualified Plan																		Non-U.S. Pension Benefits																		Postretirement Medical Benefits
			2022						2021						2020						2022						2021						2020						2022						2021						2020
Service cost			$	—					$	—					$	—					$	0.3					$	—					$	—					$	—					$	0.1					$	0.1
Interest cost			—						0.1						—						0.2						0.2						0.2						0.2						0.1						0.2
Expected return on plan assets			—						—						—						(0.4)						(0.4)						(0.3)						—						—						—
Amortization of net actuarial loss			0.1						—						0.1						—						0.1						—						—						—						—
Net periodic benefit cost (credit)			$	0.1					$	0.1					$	0.1					$	0.1					$	(0.1)					$	(0.1)					$	0.2					$	0.2					$	0.3

Schedule of Changes In Accumulated Other Comprehensive Loss

The changes in accumulated other comprehensive loss for the three years ended December 31 were as follows:

			U.S. Nonqualified Plan																		Non-U.S. Pension Benefits																		Postretirement Medical Benefits
			2022						2021						2020						2022						2021						2020						2022						2021						2020
Prior service cost			$	—					$	—					$	—					$	—					$	—					$	0.1					$	—					$	—					$	—
Net actuarial (gain) loss			(0.1)						—						—						(5.0)						0.2						1.6						(1.1)						0.6						(0.3)
Amortization of net actuarial (loss) gain			(0.1)						—						(0.1)						—						(0.1)						—						—						—						—
Total recognized in other comprehensive (income) loss			$	(0.2)					$	—					$	(0.1)					$	(5.0)					$	0.1					$	1.7					$	(1.1)					$	0.6					$	(0.3)
Total recognized in net benefit (credit) cost and other comprehensive (income) loss			$	(0.1)					$	0.1					$	—					$	(4.9)					$	—					$	1.6					$	(0.9)					$	0.8					$	—

Schedule Of Benefit Payments For Expected Future Service

The following benefit payments, which reflect expected future service, are expected to be paid:

			U.S. Nonqualified Plan						Non-U.S. Pension Benefits						Postretirement Medical Benefits
2023			$	0.1					$	0.5					$	0.7
2024			0.1						0.6						0.6
2025			0.1						0.6						0.6
2026			0.1						0.6						0.6
2027			0.1						0.6						0.6
2027 to 2030			0.4						3.7						2.3
Total			$	0.9					$	6.6					$	5.4

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