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Income Taxes - Income Tax Reconciliation (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax [Line Items] |  |  |  |  |
French business tax, gross |  |  | $ 16.4 | $ 31.2 | $ 33.7
Repatriation of non-United States earnings |  |  | 4.6 | 10.7 | 5.7
Change in valuation allowance | [1] |  | 53.5 | 13.7 | 22.0
Provision for income taxes |  |  | $ 117.1 | 183.3 | 185.7
Recognition of tax benefit |  | $ 10.8 |  |  |
2024 |  |  | 0.28% |  |
2025 |  |  | 0.19% |  |
2026 |  |  | 0.09% |  |
Germany |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Change in valuation allowance |  |  | $ 46.3 | 13.5 | 20.1
French Business Tax |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Non-United States tax rate difference: | [2] |  | $ 13.0 | $ 24.6 | $ 26.7
United States |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
U.S. Federal statutory rate (as percent) |  |  | 21.00% | 21.00% | 21.00%
French business tax difference |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Repatriation of non-United States earnings |  |  | $ 0.8 | $ 1.5 | $ 2.5
[1] | Losses incurred in 2023, 2022 and 2021 in Germany resulted in an increase in valuation allowance of $46.3, $13.5 and $20.1, respectively.
[2] | The French business tax is allowed as a deduction for French income tax purposes. The gross amount of the French business tax was $16.4, $31.2 and $33.7 for 2023, 2022, and 2021 respectively. The amounts in the table above of $13.0, $24.6 and $26.7 for 2023, 2022, and 2021, respectively, represent the French business tax expense net of the French tax benefit using the United States federal rate of 21%. In December 2023, the French Parliament approved the Finance Bill for 2024 which reversed the scheduled elimination of the business tax in 2024 and replaced it with a gradual reduction of the tax rate (i.e., 0.28% in 2024, 0.19% in 2025, 0.09% in 2026) before eliminating altogether in 2027.

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