XML 67 R54.htm IDEA: XBRL DOCUMENT v3.10.0.1
Business Combinations, Goodwill and Intangible Assets, Intangible Asset Amortization (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 2.8  
2020 2.8  
2021 2.8  
2022 2.8  
2023 2.6  
Thereafter 18.6  
Net book value $ 32.4 $ 25.0