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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Oct. 04, 2016
Operating Loss Carryforwards [Line Items]      
Income tax expense due to TCJA $ 243.8    
Subject to limitation     $ 1,900.0
Expected to expire   $ 1,600.0  
Domestic Tax Authority      
Operating Loss Carryforwards [Line Items]      
Federal net operating loss carryovers   1,100.0  
Operating loss carryforwards, subject to expiration   800.0  
Operating loss carryforwards, not subject to expiration   300.0  
Tax credits, not subject to expiration   $ 32.0