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Employee Benefit Plans - Changes in Plan Assets and Projected Benefit Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure |  |  |
Net actuarial (gain) loss | $ 5.8 | $ (1.7) | $ 5.9
Net amortization | 6.7 | (1.2) | $ 6.9
Net current-period other comprehensive income, net of taxes | 68.8 | (36.3) |
United States |  |  |
Defined Benefit Plan Disclosure |  |  |
Net actuarial (gain) loss | (5.9) | 1.7 |
Net amortization | (0.9) | (0.5) |
Effect of foreign exchange rates | 0.0 | 0.0 |
Net current-period other comprehensive income, net of taxes | (6.8) | $ 1.2 |
International Plans |  |  |
Defined Benefit Plan Disclosure |  |  |
Net actuarial (gain) loss | 0.1 |  |
Net amortization | 0.0 |  |
Effect of foreign exchange rates | 4.7 |  |
Net current-period other comprehensive income, net of taxes | $ 4.8 |  |

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