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Income Taxes - Reconciliation of the Tax Provision (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Tax provision based on U.S. federal statutory tax rate | $ 14.0 | $ 30.5 | $ 21.0
Foreign rates varying from federal statutory tax rate | (1.5) | (5.4) | (10.3)
State income taxes, net of U.S. federal income tax benefit | 7.5 | 0.7 | 1.8
U.S. taxes on foreign earnings and other tax reform impacts | 9.4 | 29.7 | 11.1
Uncertain tax positions | 8.9 | (1.5) | 5.3
Statutory adjustments, including foreign currency and tax rate changes | (9.2) | (3.8) | 0.6
Non-taxable interest income & non-deductible interest expense | (3.3) | 2.1 | (2.1)
Valuation allowances | (10.9) | (13.3) | (6.6)
Non-deductible officer compensation | 1.8 | 1.0 | 1.5
Withholding tax | 8.0 | 7.8 | 6.2
Foreign tax credit | (13.2) | (25.0) | (5.6)
Other | 1.5 | 6.6 | 2.9
Total provision for income taxes | 13.0 | 29.2 | $ 25.8
Discrete income tax benefit, net | (5.4) | (15.5) |
Effective Income Tax Rate Reconciliation, Discrete Item Related to Uncertain Tax Position, Amount | 6.9 | $ (2.7) |
Effective Income Tax Rate Reconciliation, Discrete Item Related to Return-to-Provision Adjustments, Amount | $ (4.8) |  |

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