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Goodwill and Intangible Assets - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
reporting_unit
Goodwill and Intangible Assets Disclosure [Abstract]          
Number of reporting units | reporting_unit         4
Amortization expense $ 2.9 $ 1.3 $ 4.2 $ 2.8  
Remainder of 2019 3.0   3.0    
2020 5.5   5.5    
2021 4.7   4.7    
2022 3.7   3.7    
2023 2.8   2.8    
2024 2.7   2.7    
Thereafter $ 4.1   $ 4.1