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Income Taxes - Textual (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Mar. 31, 2018
Jan. 01, 2017
Valuation Allowance [Line Items]              
Tax expense or benefit resulting from the tax cuts and jobs act $ 13.6            
Bonus depreciation deductions, tax cuts and jobs act 8.8            
Changes to valuation allowance during the period   $ 4.7 $ (2.1) $ 7.9      
Remaining valuation allowance   38.4 33.7        
Deferred tax liability and additional cash tax benefits       51.3      
Unrecognized tax benefits, decrease resulting from current period tax positions       33.7      
Deferred tax liabilities, deferred expense, reserves and accruals           $ 23.6  
Deferred revenue, additions         $ 22.2    
Unrecognized income tax benefits 0.3 0.4 0.9 0.3     $ 2.8
Unrecognized tax benefits, decrease       2.5      
Decrease in unrecognized tax benefits is reasonably possible   0.3          
Unrecognized tax benefits that would have affected effective tax rate if recognized 0.3 0.4 $ 0.9 $ 0.3      
Federal              
Valuation Allowance [Line Items]              
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability (5.8)            
State              
Valuation Allowance [Line Items]              
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability (13.8)            
Valuation allowance, deferred tax asset, increase (decrease), amount, tax cuts and jobs act $ (5.8)            
Net operating loss   $ 61.8