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Revenue from Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 2024
Revenue from Contract with Customer [Abstract]  
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
The following table summarizes our contract assets and contract liabilities (in millions):
 June 30, 2024 December 31, 2023
Current contract assets$0.9 $1.5 
Noncurrent contract assets$10.5 $4.5 
Current contract liabilities (deferred revenue)$117.3 $116.2 
Noncurrent contract liabilities (deferred revenue)$63.0 $37.6 

Changes in contract assets and liabilities during the period are as follows (in millions):
 Contract AssetsContract Liabilities
Balance as of December 31, 2023$6.0 $153.8 
Revenue recognized in advance of right to bill customer7.4 — 
Increase due to revenue deferred during the period— 116.9 
Decrease due to amortization of deferred revenue that was included in the beginning contract liability balance— (64.0)
Decrease due to amortization of deferred revenue added during the period— (20.7)
Decrease due to transfer to receivables and payables during the period(2.0)(5.7)
Balance as of June 30, 2024$11.4 $180.3 
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]
The table below reflects the expected future amortization of our contract liabilities and deferred costs recorded as of June 30, 2024. In the case of our contract liabilities related to our bareboat charter arrangements with ARO, the contract liability is not amortized and as such, the amount is reflected in the table below at the end of the current lease term. See "Note 3 - Equity Method Investment in ARO" for additional information on ARO and related arrangements.
(In millions)
 Remaining 2024202520262027 and Thereafter Total
Amortization of contract liabilities$84.6 $55.8 $34.0 $5.9 $180.3 
Amortization of deferred costs$60.4 $24.5 $14.6 $0.9 $100.4