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Other Financial Statement Data (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Aug. 31, 2016
Balance Sheet Related Disclosures [Abstract]          
Dividends Payable $ 11.8 $ 12.1 $ 96.3    
Receivables          
Trade 703.7 563.6      
Non-trade 136.1 81.3      
Current receivables, gross 839.8 644.9      
Less: Allowance for doubtful accounts 1.3 2.3      
Current receivables, net 838.5 642.6   $ 660.8  
Inventories          
Raw materials 147.5 37.8      
Work in process 625.5 349.9      
Finished goods 1,343.8 1,035.1      
Deferred Costs [1] 39.3 38.6      
Operating materials and supplies 114.1 85.8      
Inventory, net 2,270.2 1,547.2   1,533.9  
Other current assets          
Income and other taxes receivable 149.2 141.3      
Prepaid expenses 86.8 69.0      
Other 44.6 62.9      
Total other current assets 280.6 273.2      
Other Assets          
MRO inventory 134.6 114.8      
Debt Securities, Available-for-sale, Restricted 632.3 628.0      
Indemnification asset 30.7 0.0      
Long-term receivable 91.7 0.0      
Restricted cash 15.8 32.6 31.3    
Other 352.7 492.1      
Other Assets, Noncurrent 1,257.8 1,267.5      
Accrued liabilities          
Accrued dividends   12.1      
Payroll and employee benefits 217.5 159.5      
Asset retirement obligations 136.3 98.1      
Customer prepayments 199.8 140.4      
Accrued Income Taxes 65.5 1.4      
Other 461.6 342.9      
Total accrued liabilities, current 1,092.5 754.4   $ 755.3  
Other noncurrent liabilities          
Asset retirement obligations 1,023.8 761.2      
Accrued pension and postretirement benefits 146.3 53.7      
Unrecognized tax benefits 33.0 33.5      
Other 255.6 119.4      
Total other noncurrent liabilities 1,458.7 967.8      
Restricted Cash and Investments, Noncurrent [Abstract]          
Assets Held-in-trust, Noncurrent         $ 630.0
Interest expense, net was comprised of the following:          
Interest income 49.7 33.2 28.2    
Less interest expense 215.8 171.3 140.6    
Interest expense, net $ (166.1) $ (138.1) $ (112.4)    
[1] Final price deferred is product that has shipped to customers, but the price has not yet been agreed upon.