XML 60 R42.htm IDEA: XBRL DOCUMENT v3.19.1
Goodwill and Intangible Assets - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill impairments $ 0 $ 0  
Accumulated impairment loss on goodwill 535,600,000   $ 535,600,000
Intangible asset impairment $ 0 $ 0