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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Income Tax Contingency [Line Items]      
Tax expense from discrete items $ 1.9 $ 60.0  
Federal statutory tax rate 21.00%    
Probability threshold 50.00%    
Liability for Uncertainty in Income Taxes, Noncurrent $ 20.0   $ 18.0