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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Income Tax Contingency [Line Items]        
Unrecognized tax benefits due to the lapse of statutes of limitation   $ (22.8)    
Unrecognized interest and penalties related to tax benefits due to the lapse of statutes of limitation $ 2.7      
Unrecognized tax benefit more likely than not percentage threshold   50.00%    
Unrecognized tax benefits 35.2 $ 35.2    
Unrecognized tax benefits that would impact effective tax rate 27.3 27.3    
Interest expense or penalties, uncertain tax positions   2.7 $ (0.6)  
Accrued interest, uncertain tax positions $ 0.0 $ 0.0   $ 2.7
Internal Revenue Service (IRS) [Member]        
Income Tax Contingency [Line Items]        
Earliest year subject to examination   2000