Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Details)

v3.10.0.1
Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Schedule Of Income Taxes [Line Items]      
Effective income tax rate reconciliation (percent) 0.70% (82.40%)  
Excess tax benefit $ 10.1 $ 14.4  
Difference between Revenue Guidance in Effect before and after Topic 606 | Adjustments due to ASU 2014-09      
Schedule Of Income Taxes [Line Items]      
Deferred income tax liabilities     $ (0.8)