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Contract Balances (Tables)
12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Contract Balances
Contract balances at December 31 are set forth in the following table:
Balance Sheet Account20202019Change
Unbilled receivables $241.7 $183.5 $58.2 
Contract liabilities - current (1)
(1,012.0)(840.8)(171.2)
Deferred revenue - non-current (43.1)(33.2)(9.9)
Net contract assets/(liabilities)$(813.4)$(690.5)$(122.9)

(1) Consists of “Deferred revenue,” and billings in-excess of revenues (“BIE”). BIE are reported in “Other accrued liabilities” in our Consolidated Balance Sheets.