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Income Taxes - Federal Statutory Corporate Tax Rate Reconciles to Our Effective Income Tax Rate (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Computed expected tax | $ 90.2 | $ 153.2 | $ 150.4
State income taxes, net of federal tax benefit | 4.8 | 18.3 | 15.6
Foreign earnings taxed at different rates | 4.5 | 10.3 | 16.2
U.S. tax on foreign earnings | 14.9 | 16.8 | 14.3
Tax credits | (27.6) | (30.6) | (30.2)
Withholding tax | 6.0 | 7.0 | 4.7
Net change in valuation allowance | 13.0 | 1.0 | 3.6
Net change in unrecognized tax benefits | (22.3) | 65.3 | 19.6
Legislative changes | 0.0 | 0.0 | 5.1
Deferred tax adjustments | 0.4 | 0.0 | 11.4
Other | 6.5 | (3.3) | 14.3
Total income tax provision | $ 90.4 | $ 238.0 | $ 225.0
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Computed expected tax | 21.00% | 21.00% | 21.00%
State income taxes, net of federal tax benefit | 1.10% | 2.50% | 2.20%
Foreign earnings taxed at different rates | 1.00% | 1.40% | 2.20%
U.S. tax on foreign earnings | 3.50% | 2.30% | 2.00%
Tax credits | (6.40%) | (4.20%) | (4.20%)
Withholding tax | 1.40% | 1.00% | 0.70%
Net change in valuation allowance | 3.00% | 0.10% | 0.50%
Net change in unrecognized tax benefits | (5.20%) | 9.00% | 2.70%
Legislative changes | 0.00% | 0.00% | 0.70%
Deferred tax adjustments | 0.10% | 0.00% | 1.60%
Other | 1.50% | (0.50%) | 2.00%
Income tax provision and rate | 21.00% | 32.60% | 31.40%

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