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Other Financial Statement Data (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Receivables      
Trade $ 954.6 $ 632.8  
Accounts Receivable, Related Parties, Current 390.1 99.7  
Non-trade 187.7 149.0  
Accounts Receivable, before Allowance for Credit Loss 1,532.4 881.5  
Less: Allowance for doubtful accounts 0.5 0.4  
Current receivables, net 1,531.9 881.1  
Inventories      
Raw materials 296.6 92.1  
Work in process 741.1 634.5  
Finished goods 1,534.3 868.2  
Deferred Costs [1] 31.4 23.0  
Operating materials and supplies 138.0 121.4  
Inventory, net 2,741.4 1,739.2  
Other current assets      
Income and other taxes receivable 126.1 181.4  
Prepaid expenses 107.3 80.4  
Other 49.1 65.1  
Total other current assets 282.5 326.9  
Other Assets      
Restricted cash 8.5 12.3 $ 5.4
MRO inventory 144.7 137.7  
Debt Securities, Available-for-sale, Restricted 731.5 734.3  
Operating Lease, Right-of-Use Asset 120.2 173.1  
Indemnification asset 21.0 23.0  
Long-term receivable 41.5 52.6  
Other 307.3 255.8  
Other Assets, Noncurrent 1,374.7 1,388.8  
Accrued liabilities      
Accrued dividends 43.6 20.4  
Payroll and employee benefits 235.9 195.5  
Asset retirement obligations 222.4 190.2  
Customer prepayments 437.7 287.6  
Accrued Income Taxes 184.3 83.1  
Operating Lease, Liability, Current 59.7 64.0  
Servicing Liability 81.1 0.0  
Other 618.9 392.3  
Total accrued liabilities, current 1,883.6 1,233.1  
Other noncurrent liabilities      
Asset retirement obligations 1,526.9 1,203.7  
Operating Lease, Liability, Noncurrent 64.3 109.6  
Accrued pension and postretirement benefits 114.4 158.5  
Unrecognized tax benefits 156.6 46.4  
Other 239.9 235.3  
Total other noncurrent liabilities 2,102.1 1,753.5  
Interest expense, net was comprised of the following:      
Interest income 25.2 33.5 33.1
Less interest expense 194.3 214.1 216.0
Interest expense, net (169.1) (180.6) $ (182.9)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Operating Lease, Right-of-Use Asset 120.2 173.1  
Other Noncurrent Assets      
Other Assets      
Operating Lease, Right-of-Use Asset 120.2 173.1  
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Operating Lease, Right-of-Use Asset $ 120.2 $ 173.1  
[1] Final price deferred is product that has shipped to customers, but we retain control and do not recognize revenue until a sales contract has been agreed to with the customer.