XML 50 R40.htm IDEA: XBRL DOCUMENT v3.19.1
Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Carrying amount    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Outstanding interest-bearing obligations $ 34.9 $ 34.9
Estimated fair value | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Outstanding interest-bearing obligations $ 34.9 $ 34.9