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Income Taxes - Income Tax Reconciliation (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 21, 2017
Income Tax [Line Items] |  |  |  |  |
French business tax, gross |  | $ 69.5 | $ 74.8 | $ 72.1 |
Repatriation of non-United States earnings |  | (17.8) | 2.5 | 69.7 |
United States Tax Act and French tax reform | $ (73.7) |  | 3.2 | (73.7) |
French Business Tax |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Non-United States tax rate difference: |  | $ 54.9 | $ 59.1 | $ 46.9 |
United States |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
U.S. Federal statutory rate (as percent) |  | 21.00% | 21.00% | 35.00% |
French business tax difference |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Non-United States tax rate difference: |  | $ (9.3) | $ (10.1) | $ 0.4 |
Repatriation of non-United States earnings |  |  | (25.5) | 1.3 |
French CICE |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Non-United States tax rate difference: |  |  | $ (39.9) | $ (77.1) |
Expense recorded prior to the Tax Act |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Repatriation of non-United States earnings |  |  |  |  | $ 83.3

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