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REVENUE (Tables)
3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Accounts receivables and current and long-term contract assets and liabilities
The Company’s Accounts receivable and current and long-term contract assets and liabilities are summarized in the following table.
Accounts Receivable,
Less Allowance
Contract
Assets
(Current)
Contract
Assets
(Long-Term)
Contract Liabilities
(Current)
Contract Liabilities
(Long-Term)
Balance at December 31, 2020$2,078.1 $52.0 $170.7 $266.3 $8.2 
Balance at March 31, 20212,414.1 61.7 157.2 182.6 8.4 
Schedule of allowance for doubtful accounts
The following table summarizes the movement in the Company's allowance for doubtful accounts:
20212020
Balance at January 1$53.5 $36.5 
Adjustment upon adoption of ASU 2016-13 3.0 
Bad debt expense6.4 30.2 
Uncollectible accounts written off, net of recoveries(1.1)(9.5)
Balance at March 31$58.8 $60.2