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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Contract with Customer, Asset and Liability [Table Text Block]
The following table summarizes our contract assets and contract liabilities (in millions):
SuccessorPredecessor
 December 31, 2021 December 31, 2020
Current contract assets$0.3 $1.4 
Noncurrent contract assets$— $0.4 
Current contract liabilities (deferred revenue)$45.8 $57.6 
Noncurrent contract liabilities (deferred revenue)$10.8 $14.3 
    
Changes in contract assets and liabilities during the period are as follows (in millions):
 Contract AssetsContract Liabilities
Balance as of December 31, 2020 (Predecessor)$1.8 $71.9 
Revenue recognized in advance of right to bill customer2.3 — 
Increase due to cash received— 10.2 
Decrease due to amortization of deferred revenue that was included in the beginning contract liability balance— (14.8)
Decrease due to transfer to receivables during the period(1.6)— 
Fresh start accounting revaluation(0.3)(31.6)
Balance as of April 30, 2021 (Predecessor)2.2 35.7 
Balance as of May 1, 2021 (Successor)2.2 35.7 
Revenue recognized in advance of right to bill customer2.5 — 
Increase due to cash received— 80.1 
Decrease due to amortization of deferred revenue that was added during the period— (21.5)
Decrease due to transfer to receivables and payables during the period(4.4)(37.7)
Balance as of December 31, 2021 (Successor)$0.3 $56.6 
Expected Future Amortization of Contract Liabilities December 31, 2021 is set forth in the table below (in millions):
 2022202320242025 & Thereafter Total
Amortization of contract liabilities$45.8 $7.8 $1.2 $1.8 $56.6 
Amortization of deferred costs$26.9 $6.9 $0.9 $— $34.7