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Income Taxes Deferred Tax (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred Tax Liabilities, Gross [Abstract]      
Depreciation and amortization $ 232.5 $ 70.7  
Depletion 527.0 530.7  
Partnership tax basis differences 69.0 69.8  
Undistributed earnings of non-U.S. subsidiaries 3.8 3.8  
Other liabilities 32.5 19.0  
Total deferred tax liabilities 864.8 694.0  
Before valuation allowance      
Deferred revenue 62.4 0.0  
Capital loss carryforwards 0.1 0.0  
Foreign tax credit carryforwards 628.6 522.5  
Net operating loss carryforwards 321.8 420.0  
Pension plans and other benefits 34.2 43.8  
Asset retirement obligations 262.9 232.1  
Disallowed interest expense under 163(j) 68.8 58.1  
Other assets 287.6 349.3  
Subtotal 1,666.4 1,625.8  
Net of valuation allowance      
Valuation allowance 683.0 1,457.1  
Deferred Tax Assets, Net of Valuation Allowance 983.4 168.7  
Deferred Tax Assets, Net   (525.3)  
Deferred Tax Liabilities, Net 118.6    
Anticipatory Foreign Tax Credit Carryforward      
Net of valuation allowance      
Valuation allowance 235.5 224.6 $ 361.6
Deferred Tax Liabilities and Assets [Line Items]      
Deferred Tax Assets Foreign Tax Credits Netted Against Related Deferred Tax Liabilities $ 191.0 $ 224.6