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Pension Plans - Schedule of Assumptions Used (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
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
U.K. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 4.80% | 1.90% | 1.40%
Expected return on assets | 5.60% | 3.30% | 3.00%
Life expectancy of male in the U.K. aged 65 at accounting date | 21 years 2 months 12 days | 21 years 1 month 6 days |
Life expectancy of female in the U.K. aged 65 at accounting date | 23 years | 22 years 10 months 24 days |
Life expectancy of male in the U.K. aged 65 at 20 years after accounting date | 22 years 6 months | 22 years 4 months 24 days |
Life expectancy of female in the U.K. aged 65 at 20 years after accounting date | 24 years 6 months | 24 years 4 months 24 days |
Fair value of plan assets | $ 252.6 | $ 376.6 | $ 358.9
U.K. | Retirement Plan Pre-2030 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Retail Price Inflation | 3.20% | 3.30% | 2.90%
Consumer Price Inflation | 2.10% | 2.20% | 1.80%
U.K. | Retirement Plan Pre-2030 | Pre 6 April 1997 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of pension increases | 1.90% | 2.00% | 1.70%
U.K. | Retirement Plan Pre-2030 | 1997 To 2005 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of pension increases | 2.10% | 2.20% | 1.90%
U.K. | Retirement Plan Pre-2030 | Post 5 April 2005 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of pension increases | 1.70% | 1.80% | 1.60%
U.K. | Retirement Plan Post-2030 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Retail Price Inflation | 3.20% | 3.30% | 2.70%
Consumer Price Inflation | 3.10% | 3.20% | 2.60%
U.K. | Retirement Plan Post-2030 | Pre 6 April 1997 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of pension increases | 2.40% | 2.50% | 2.20%
U.K. | Retirement Plan Post-2030 | 1997 To 2005 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of pension increases | 3.00% | 3.10% | 2.60%
U.K. | Retirement Plan Post-2030 | Post 5 April 2005 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of pension increases | 2.20% | 2.20% | 2.00%
Foreign Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 28.1 | $ 46.8 | $ 45.0
U.S. / other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 5.10% | 2.70% | 2.30%
Expected return on assets | 4.70% | 2.50% | 5.00%

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