v3.21.1
REVENUE RECOGNITION - Receivables and deferred revenue (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Current assets:    
Receivables related to contracts with customers $ 22.3 $ 23.1
Miscellaneous receivables 63.7 67.9
Receivables, net 86.0 91.0
Current liabilities:    
Deferred revenue related to contracts with customers 402.1 400.6
Miscellaneous deferred income 2.2 4.8
Deferred revenues and income $ 404.3 $ 405.4