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Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 2.8 $ 1.9 $ 1.0
Gross increases based on tax positions related to the current year 1.4 1.0 0.9
Reductions due to expiry of statute of limitations (1.0) (0.1) 0.0
Ending balance 3.2 2.8 1.9
Non-current $ 3.2 $ 2.8 $ 1.9