v3.20.1
REVENUE RECOGNITION - Receivables and deferred revenue (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Current assets    
Receivables related to contracts with customers $ 29.4 $ 160.3
Miscellaneous receivables 97.4 93.9
Receivables, net 126.8 254.2
Current liabilities    
Deferred revenue related to contracts with customers 396.4 447.1
Miscellaneous deferred income 3.9 2.1
Deferred revenues and income $ 400.3 $ 449.2