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Derivative Instruments (Tables)
12 Months Ended
Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Gains And Losses On Derivatives Designated As Cash Flow Hedges Gains and losses, net of tax, on derivatives designated as cash flow hedges included in our Consolidated Statements of Operations and comprehensive loss were as follows (in millions):
Gain (Loss) Recognized in Other Comprehensive
Income ("OCI")
on Derivatives
  (Effective Portion)  
SuccessorPredecessor
Eight Months Ended December 31, 2021Four Months Ended April 30, 2021Year Ended December 31, 2020Year Ended December 31, 2019
Foreign currency forward contracts— — (5.4)1.6 
Total$— $— $(5.4)$1.6 

(Gain) Loss Reclassified from
 AOCI into Income
(Effective Portion)(1)
SuccessorPredecessor
Eight Months Ended December 31, 2021Four Months Ended April 30, 2021Year Ended December 31, 2020Year Ended December 31, 2019
Interest rate lock contracts(2) 
$— $— $— $1.9 
Foreign currency forward contracts(3)
— (5.6)(11.6)6.4 
Total$— $(5.6)$(11.6)$8.3 
 
(1)Changes in the fair value of cash flow hedges are recorded in AOCI. Amounts recorded in AOCI associated with cash flow hedges are subsequently reclassified into contract drilling expense, depreciation or interest expense as earnings are affected by the underlying hedged forecasted transaction.

(2)Losses on interest rate lock derivatives reclassified from AOCI into income were included in Interest expense, net, in our Consolidated Statements of Operations.

(3)During the four months ended April 30, 2021 (Predecessor), $5.6 million of gains were reclassified from AOCI into Loss on impairment in our Consolidated Statements of Operations in connection with the impairment of certain rigs. During the year ended December 31, 2020 (Predecessor), $2.0 million of losses were reclassified from AOCI into Contract drilling expense and $13.6 million of gains were reclassified from AOCI into Depreciation expense in our Consolidated Statements of Operations. During the year ended December 31, 2019 (Predecessor), $7.3 million of losses were reclassified from AOCI into Contract drilling expense and $0.9 million of gains were reclassified from AOCI into Depreciation expense in our Consolidated Statements of Operations.