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Income Taxes - Textual (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2018
Income Tax Contingency [Line Items]            
Provision for income tax expense $ 23.5 $ 29.3 $ 54.3 $ 59.3    
Document Period End Date     Jun. 30, 2019      
Net deferred tax assets 42.6   $ 42.6      
Valuation allowance 34.3   34.3      
Additional tax benefits due to approval of accounting method change         $ 51.3  
Gross unrecognized tax benefits 0.6   0.6     $ 0.9
Unrecognized tax benefits which would affect our effective tax rate if recognized 0.6   0.6     $ 0.9
Amount of decrease in unrecognized tax benefit to be released 0.2   0.2      
State and Local Jurisdiction [Member]            
Income Tax Contingency [Line Items]            
Operating Loss Carryforwards $ 62.8   $ 62.8