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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2023
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, 2023Year Ended December 31, 2022Eight Months Ended December 31, 2021Four Months Ended April 30, 2021
Current income tax expense (benefit):
   
U.S.$(30.3)$12.4 $5.5 $— 
Non-U.S.34.1 22.8 52.2 34.4 
 3.8 35.2 57.7 34.4 
Deferred income tax expense (benefit):   
U.S.1.9 8.5 (6.6)— 
Non-U.S.(788.3)(0.6)(14.7)(18.2)
 (786.4)7.9 (21.3)(18.2)
Total income tax expense (benefit)$(782.6)$43.1 $36.4 $16.2 
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, 2023December 31, 2022
Deferred tax assets:
 
Net operating loss carryforwards$3,308.9 $3,028.7 
Property and equipment1,535.1 1,454.8 
Interest limitation carryforwards123.4 193.4 
Foreign tax credits44.7 60.7 
Employee benefits, including share-based compensation41.6 43.1 
Premiums on long-term debt6.0 8.1 
Other14.4 20.1 
Valuation allowance(4,192.4)(4,720.3)
Total deferred tax assets881.7 88.6 
Deferred tax liabilities(26.8)(19.4)
Net deferred tax asset$854.9 $69.2 
Summary Of Effective Income Tax Rate On Continuing Operations
Our consolidated effective income tax rate for the years ended December 31, 2023 and 2022, eight months ended December 31, 2021 (Successor), and four months ended April 30, 2021 (Predecessor), respectively, differs from the Bermuda and U.K. statutory income tax rates as follows:
SuccessorPredecessor
Year Ended December 31, 2023Year Ended December 31, 2022Eight Months Ended December 31, 2021Four Months Ended April 30, 2021
Bermuda (Successor)/ U.K. (Predecessor) statutory income tax rate
— %— %— %19.0 %
Non-Bermuda (Successor) taxes
74.0 22.8 376.0 — 
Valuation allowance(953.6)0.6 (119.5)(1.8)
Resolution of prior year items
(49.9)(7.0)216.2 (0.4)
Switzerland Tax Reform— — (188.3)— 
Asset impairments— — — (3.2)
Other— 2.8 — (14.0)
Effective income tax rate(929.5)%19.2 %284.4 %(0.4)%
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 years ended December 31, 2023 and 2022, eight months ended December 31, 2021 (Successor), and four months ended April 30, 2021 (Predecessor) (in millions) were as follows:
SuccessorPredecessor
Year Ended December 31, 2023Year Ended December 31, 2022Eight Months Ended December 31, 2021Four Months Ended April 30, 2021
Balance, beginning of period$217.6 $235.1 $235.4 $237.7 
Increase as a result of tax positions taken during prior years
88.6 3.0 34.6 2.9 
Lapse of applicable statutes of limitations(73.6)(4.5)(20.2)(0.2)
Settlements with taxing authorities(41.8)(16.5)(6.6)— 
Increases as a result of tax positions taken during the current year
13.4 11.2 6.9 12.6 
Impact of foreign currency exchange rates0.6 (9.7)(10.5)(17.6)
Decreases as a result of tax positions taken during prior years
(3.4)(1.0)(4.5)— 
Balance, end of period$201.4 $217.6 $235.1 $235.4