XML 50 R39.htm IDEA: XBRL DOCUMENT v3.21.1
Revenue Recognition and Related Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]      
Trade receivables, allowance for doubtful accounts $ 51.8   $ 49.8
Contract assets 46.6   44.3
Deferred revenue 393.6   442.6
Revenue recognized     176.2
Aggregate assets associated with incremental costs to obtain a contract and contract fulfillment costs 49.5   $ 46.6
Amortization related to contract costs $ 49.8 $ 37.7  
Performance obligation period Revenue from customers who are subject to contracts is generally recognized over the term of such contracts, which is typically 12 months for our residential service contracts, one to three years for our mobile service contracts and one to five years