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Income Taxes - Reconciliation of Income Tax Expense due to the U.S. Federal Statutory Corporate Tax Rate (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Provision at the U.S. federal statutory rate | $ 77.7 | $ 47.7 | $ 43.1
Increase (decrease) resulting from: |  |  |
State income tax, net of benefit for federal deduction | 5.8 | 5.2 | 3.6
Foreign income tax rate differential | (1.4) | 0.9 | (0.3)
Tax Credits | (0.3) | (1.1) | (1.3)
Changes in valuation allowances | 2.3 | (1.7) | 3.4
Tax Act — Enactment date effect | 0.0 | 0.0 | (0.6)
Stock-based compensation | (0.8) | 0.0 | (0.1)
Uncertain tax benefits | (0.3) | 0.7 | 0.4
Other | 0.8 | 1.6 | (0.7)
(Benefit) provision for income taxes | $ 83.8 | $ 53.3 | $ 47.6

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