Annual report pursuant to Section 13 and 15(d)

Subsequent Event (Details)

v3.10.0.1
Subsequent Event (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Subsequent Event [Line Items]    
Earnings not permanently reinvested, joint venture tax basis   $ 23.6
Scenario, Forecast | Dart | Disposal Group, Held-for-sale, Not Discontinued Operations    
Subsequent Event [Line Items]    
Consideration $ 75.0  
Cash proceeds $ 40.0