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Income Taxes Deferred Tax (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred Tax Liabilities, Gross [Abstract]        
Depreciation and amortization $ 456.2 $ 232.5    
Depletion 430.1 527.0    
Partnership tax basis differences 66.3 69.0    
Undistributed earnings of non-U.S. subsidiaries 0.0 3.8    
Other liabilities 39.1 32.5    
Total deferred tax liabilities 991.7 864.8    
Before valuation allowance        
Deferred revenue 0.0 62.4    
Capital loss carryforwards 0.0 0.1    
Foreign tax credit carryforwards 775.1 628.6    
Net operating loss carryforwards 232.3 321.8    
Pension plans and other benefits 19.8 34.2    
Asset retirement obligations 337.3 262.9    
Disallowed interest expense under 163(j) 31.6 68.8    
Other assets 351.2 287.6    
Subtotal 1,747.3 1,666.4    
Net of valuation allowance        
Valuation allowance 774.7 683.0 $ 1,457.1 $ 1,530.5
Deferred Tax Assets, Net of Valuation Allowance 972.6 983.4    
Deferred Tax Assets, Net   118.6    
Deferred Tax Liabilities, Net (19.1)      
Anticipatory Foreign Tax Credit Carryforward        
Net of valuation allowance        
Valuation allowance 229.6 235.5    
Deferred Tax Liabilities and Assets [Line Items]        
Deferred Tax Assets Foreign Tax Credits Netted Against Related Deferred Tax Liabilities $ 185.1 $ 191.0