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Pension Plans - Fair Value of Plans Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 280.7	$ 423.4	$ 403.9
Equities and growth funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	78.3	149.9
Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	65.7	64.6
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	133.6	194.1
Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3.1	14.8
U.K.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	252.6	376.6	358.9
U.K. | Equities and growth funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	78.3	149.9
U.K. | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	65.7	64.6
U.K. | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	106.1	147.5
U.K. | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2.5	14.6
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28.1	46.8	$ 45.0
Foreign Plan | Equities and growth funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Foreign Plan | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Foreign Plan | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	27.5	46.6
Foreign Plan | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0.6	$ 0.2

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
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