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Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2021

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Defined Benefit Plan, Assumptions [Table Text Block]

			Pension Benefits																																				OPEB
			2021												2020												2019												2021						2020						2019
			U.S.						U.K.						U.S.						U.K.						U.S.						U.K.
Discount rate			2.90		%				1.85		%				2.50		%				1.55		%				3.40		%				2.05		%				2.90		%				2.55		%				3.35		%
Expected return on plan assets			7.00		%				4.00		%				7.25		%				4.00		%				7.25		%				4.00		%				N/A						N/A						N/A
Rate of compensation increase			N/A						3.70		%				N/A						3.15		%				N/A						3.15		%				4.00		%				4.00		%				4.00		%

Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]

The following table summarizes the changes in projected benefit obligations and plan assets and reconciles the funded status of the benefit plans, which is the net benefit plan liability:

			Pension Benefits												OPEB
			December 31,												December 31,
			2021						2020						2021						2020
			(in millions)
Change in benefit obligation
Benefit obligation at beginning of year			$	798.9					$	740.2					$	586.5					$	549.1
Service cost			2.0						2.0						0.3						0.4
Interest cost			17.3						21.4						8.4						10.2
Actuarial loss (gain)			(6.5)						63.5						(34.6)						25.3
Change in GM portion of OPEB obligation			—						—						(36.8)						14.0
Participant contributions			0.2						0.2						—						—
Settlements			(99.0)						(3.3)						—						—
Benefit payments			(34.4)						(34.4)						(14.2)						(12.5)
Currency fluctuations			(4.4)						8.7						—						—
Other			—						0.6						—						—
Net change			(124.8)						58.7						(76.9)						37.4
Benefit obligation at end of year			$	674.1					$	798.9					$	509.6					$	586.5
Change in plan assets
Fair value of plan assets at beginning of year			$	669.9					$	636.6					$	—					$	—
Actual return on plan assets			31.6						55.7						—						—
Employer contributions			7.8						8.5						14.2						12.5
Participant contributions			0.2						0.2						—						—
Benefit payments			(34.4)						(34.4)						(14.2)						(12.5)
Settlements			(99.0)						(3.3)						—						—
Currency fluctuations			(2.3)						6.6						—						—
Net change			(96.1)						33.3						—						—
Fair value of plan assets at end of year			$	573.8					$	669.9					$	—					$	—

Schedule of Amounts Recognized in Balance Sheet [Table Text Block]

Amounts recognized in our Consolidated Balance Sheets are as follows:

			Pension Benefits												OPEB
			December 31,												December 31,
			2021						2020						2021						2020
			(in millions)
Noncurrent assets			$	27.6					$	20.2					$	—					$	—
Current liabilities			(6.6)						(8.0)						(28.4)						(29.8)
Noncurrent liabilities			(121.3)						(141.2)						(481.2)						(556.7)
Net liability			$	(100.3)					$	(129.0)					$	(509.6)					$	(586.5)

Schedule of Pre-tax Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

Pre-tax amounts recorded in accumulated other comprehensive income (loss) (AOCI), not yet recognized in net periodic benefit cost (credit) as of December 31, 2021 and 2020, consists of:

			Pension Benefits												OPEB
			December 31,												December 31,
			2021						2020						2021						2020
			(in millions)
Net actuarial gain (loss)			$	(225.4)					$	(278.0)					$	31.3					$	(4.9)
Net prior service credit (cost)			(1.6)						(1.8)						1.6						3.1
Total amounts recorded			$	(227.0)					$	(279.8)					$	32.9					$	(1.8)

Schedule of Net Benefit Costs [Table Text Block]

The components of net periodic benefit cost (credit) are as follows:

			Pension Benefits																		OPEB
			2021						2020						2019						2021						2020						2019
			(in millions)
Service cost			$	2.0					$	2.0					$	1.5					$	0.3					$	0.4					$	0.3
Interest cost			17.3						21.4						28.0						8.4						10.2						12.8
Expected asset return			(39.0)						(38.4)						(41.1)						—						—						—
Amortized actuarial loss			10.8						8.6						6.4						1.7						1.0						0.1
Amortized prior service cost (credit)			0.1						0.1						—						(1.5)						(1.5)						(1.5)
Settlement charge			42.3						0.5						10.4						—						—						—
Net periodic benefit cost (credit)			$	33.5					$	(5.8)					$	5.2					$	8.9					$	10.1					$	11.7

Schedule of Allocation of Plan Assets [Table Text Block]

			U.S.																		U.K.
															Target																		Target
			2021						2020						Allocation						2021						2020						Allocation
Equity securities			27.9		%				34.7		%				25% - 35%						21.6		%				21.8		%				15% - 30%
Fixed income securities			63.8						57.3						60% - 70%						66.0						65.9						70% - 80%
Alternative assets			7.5						7.3						0% - 10%						9.9						8.9						5% - 10%
Cash			0.8						0.7						0% - 5%						2.5						3.4						0% - 5%
Total			100.0		%				100.0		%										100.0		%				100.0		%

The primary objective of our pension plan assets is to provide a source of retirement income for participants and beneficiaries. Our primary financial objectives for the pension plan assets have been established in conjunction with a comprehensive review of our current and projected financial requirements. These objectives include having the ability to pay all future benefits and expenses when due, maintaining flexibility and minimizing volatility. These objectives are based on a long-term investment horizon.

Defined Benefit Pension Plan Assets Investments in our defined benefit plans are stated at fair value. Level 1 assets are valued using quoted market prices that represent the asset value of the shares held by the trusts. The level 2 assets are investments in pooled funds, which are valued using a model to reflect the valuation of their underlying assets that are publicly traded with observable values. The fair values of our pension plan assets are as follows:

December 31, 2021
Asset Categories						Level 1						Level 2						Level 3						Total
						(in millions)
Cash and Cash Equivalents						$	7.8					$	0.8					$	—					$	8.6
Equity
U.S. Large Cap						54.0						0.1						—						54.1
U.S. Small/Mid Cap						15.2						—						—						15.2
World Equity						66.9						10.7						—						77.6
Fixed Income Securities
Government & Agencies						80.2						52.7						—						132.9
Corporate Bonds - Investment Grade						189.9						1.3						—						191.2
Corporate Bonds - Non-investment Grade						15.7						0.5						—						16.2
Emerging Market Debt						12.5						—						—						12.5
Other						11.2						5.8						—						17.0
Other
Property Funds (a)						—						—						—						38.2
Liquid Alternatives Fund (a)						—						—						—						1.9
Structured Credit Fund (a)						—						—						—						8.4
Total Plan Assets						$	453.4					$	71.9					$	—					$	573.8
December 31, 2020
Asset Categories						Level 1						Level 2						Level 3						Total
						(in millions)
Cash and Cash Equivalents						$	7.4					$	2.9					$	—					$	10.3
Equity
U.S. Large Cap						88.1						2.7						—						90.8
U.S. Small/Mid Cap						20.5						—						—						20.5
World Equity						87.0						7.8						—						94.8
Fixed Income Securities
Government & Agencies						84.1						45.9						—						130.0
Corporate Bonds - Investment Grade						219.0						2.7						—						221.7
Corporate Bonds - Non-investment Grade						22.4						0.7						—						23.1
Emerging Market Debt						21.1						1.1						—						22.2
Other						3.6						0.3						—						3.9
Other
Property Funds (a)						—						—						—						44.2
Liquid Alternatives Fund (a)						—						—						—						1.8
Structured Credit Fund (a)						—						—						—						6.6
Total Plan Assets						$	553.2					$	64.1					$	—					$	669.9

(a) In accordance with ASC 820 - Fair Value Measurement certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the Consolidated Balance Sheets.

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- Definition

Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans.

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Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall.

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Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized.

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Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost.

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Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate.

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Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

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