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Other Financial Statement Data (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Receivables      
Trade $ 632.8 $ 644.2  
Accounts Receivable, Related Parties, Current 99.7 5.1  
Non-trade 149.0 158.1  
Accounts Receivable, before Allowance for Credit Loss 881.5 807.4  
Less: Allowance for doubtful accounts 0.4 3.5  
Current receivables, net 881.1 803.9  
Inventories      
Raw materials 92.1 68.3  
Work in process 634.5 618.4  
Finished goods 868.2 1,219.3  
Deferred Costs [1] 23.0 47.9  
Operating materials and supplies 121.4 122.5  
Inventory, net 1,739.2 2,076.4  
Other current assets      
Income and other taxes receivable 181.4 179.5  
Prepaid expenses 80.4 110.7  
Other 65.1 28.6  
Total other current assets 326.9 318.8  
Other Assets      
Restricted cash 12.3 5.4 $ 15.8
MRO inventory 137.7 126.8  
Debt Securities, Available-for-sale, Restricted 734.3 691.7  
Operating Lease, Right-of-Use Asset 173.1 192.1  
Indemnification asset 23.0 40.6  
Long-term receivable 52.6 81.6  
Other 255.8 316.2  
Other Assets, Noncurrent 1,388.8 1,454.4  
Accrued liabilities      
Accrued dividends 20.4 20.0  
Payroll and employee benefits 195.5 173.8  
Asset retirement obligations 190.2 154.4  
Customer prepayments 287.6 266.9  
Accrued Income Taxes 83.1 67.8  
Operating Lease, Liability, Current 64.0 67.1  
Other 392.3 331.9  
Total accrued liabilities, current 1,233.1 1,081.9  
Other noncurrent liabilities      
Asset retirement obligations 1,203.7 1,160.8  
Operating Lease, Liability, Noncurrent 109.6 127.0  
Accrued pension and postretirement benefits 158.5 173.6  
Unrecognized tax benefits 46.4 42.1  
Other 235.3 269.5  
Total other noncurrent liabilities 1,753.5 1,773.0  
Interest expense, net was comprised of the following:      
Interest income 33.5 33.1 49.7
Less interest expense 214.1 216.0 215.8
Interest expense, net $ (180.6) $ (182.9) $ (166.1)
[1] Final price deferred is product that has shipped to customers, but the price has not yet been agreed upon.