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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2022
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]  
Summary Of Components Of Provision For Income Taxes From Continuing Operations
The components of our provision for income taxes are summarized as follows (in millions):
SuccessorPredecessor
Year Ended December 31, 2022Eight Months Ended December 31, 2021Four Months Ended April 30, 2021Year Ended December 31, 2020
Current income tax expense (benefit):   
U.S.$12.4 $5.5 $— $(135.3)
Non-U.S.22.8 52.2 34.4 (18.4)
 35.2 57.7 34.4 (153.7)
Deferred income tax expense (benefit):   
U.S.8.5 (6.6)— (92.9)
Non-U.S.(0.6)(14.7)(18.2)(12.8)
 7.9 (21.3)(18.2)(105.7)
Total income tax expense (benefit)$43.1 $36.4 $16.2 $(259.4)
Summary Of Significant Components Of Deferred Income Tax Assets (Liabilities)
The components of deferred income tax assets and liabilities are summarized as follows (in millions):
December 31, 2022December 31, 2021
Deferred tax assets:
 
Net operating loss carryforwards$3,028.7 $2,297.5 
Property and equipment1,454.8 1,361.6 
Interest limitation carryforwards193.4 74.8 
Foreign tax credits60.7 105.7 
Employee benefits, including share-based compensation43.1 51.2 
Premiums on long-term debt8.1 9.7 
Other20.1 15.4 
Total deferred tax assets4,808.9 3,915.9 
Valuation allowance(4,720.3)(3,829.0)
Net deferred tax assets88.6 86.9 
Deferred tax liabilities:
  
Property and equipment— — 
Other(19.4)(14.5)
Total deferred tax liabilities(19.4)(14.5)
Net deferred tax asset$69.2 $72.4 
Summary Of Effective Income Tax Rate On Continuing Operations
Our consolidated effective income tax rate for the year ended December 31, 2022 (Successor), the eight months ended December 31, 2021 (Successor), the four months ended April 30, 2021 (Predecessor) and the year ended December 31, 2020 (Predecessor), respectively, differs from the Bermuda and U.K. statutory income tax rates as follows:
SuccessorPredecessor
Year Ended December 31, 2022Eight Months Ended December 31, 2021Four Months Ended April 30, 2021Year Ended December 31, 2020
Bermuda (Successor)/ U.K. (Predecessor) statutory income tax rate
— %— %19.0 %19.0 %
Asset impairments— — (3.2)(12.5)
Non-Bermuda (Successor) taxes
22.8 376.0 — — 
Non-U.K. (Predecessor) taxes
— — 1.0 (2.8)
Resolution of prior year items
(7.0)216.2 (0.4)1.8 
Switzerland Tax Reform— (188.3)— — 
Valuation allowance0.6 (119.5)(1.8)(1.5)
U.S. tax reform and U.S. CARES Act— — — 2.4 
Contract termination2.8 — — — 
Other— — (15.0)(1.3)
Effective income tax rate19.2 %284.4 %(0.4)%5.1 %
Summary Of Reconciliation Of The Beginning And Ending Amount Of Unrecognized Tax Benefits A reconciliation of the beginning and ending amount of unrecognized tax benefits for the year ended December 31, 2022 (Successor), the eight months ended December 31, 2021 (Successor) and the four months ended April 30, 2021 (Predecessor), respectively (in millions) follows:
SuccessorPredecessor
Year Ended December 31, 2022Eight Months Ended December 31, 2021Four Months Ended April 30, 2021
Balance, beginning of period$235.1 $235.4 $237.7 
Settlements with taxing authorities(16.5)(6.6)— 
Increases in unrecognized tax benefits as a result of tax positions taken during the current year11.2 6.9 12.6 
Impact of foreign currency exchange rates(9.7)(10.5)(17.6)
Lapse of applicable statutes of limitations(4.5)(20.2)(0.2)
Increase in unrecognized tax benefits as a result of tax positions taken during prior years3.0 34.6 2.9 
Decreases in unrecognized tax benefits as a result of tax positions taken during prior years(1.0)(4.5)— 
Balance, end of period$217.6 $235.1 $235.4