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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