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Customer Contracts (Tables)
3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of Balances Related to Customer Contracts
The following table presents the balances related to customer contracts:
(In millions)Consolidated Balance Sheets AccountDecember 31, 2020March 31, 2021
Accounts receivable, net
Accounts receivable, net (1)
$483.0 $488.8 
Current portion of contract assetsOther current assets12.2 13.6 
Non-current portion of contract assetsOther non-current assets13.9 12.1 
Current portion of deferred revenueDeferred revenue76.7 89.0 
Non-current portion of deferred revenueOther non-current liabilities14.2 13.4 
(1)    Allowance for doubtful accounts and accrued customer credits was $28.3 million and $24.0 million as of December 31, 2020 and March 31, 2021, respectively.
Schedule of Capitalized Contract Cost
Amortization of capitalized sales commissions and implementation costs was as follows:
Three Months Ended March 31,
(In millions)20202021
Amortization of capitalized sales commissions$10.9 $10.8 
Amortization of capitalized implementation costs4.2 4.4