XML 71 R44.htm IDEA: XBRL DOCUMENT v3.19.2
Cash and cash equivalents (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Cash deposits $ 389.6 $ 60.3    
Term deposits 9.3 9.4    
Cash and cash equivalents 398.9 69.7 $ 72.1 $ 511.1
Proceeds from borrowings, classified as financing activities 435.0 237.0    
Credit Facility        
Proceeds from borrowings, classified as financing activities 275.0 $ 210.0    
Credit Facility | Marcellus Shale Royalties Pennsylvania        
Proceeds from borrowings, classified as financing activities $ 275.0