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Derivative Instruments, Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial liabilities [Abstract]      
Liquidity Option $ 509.6 $ 390.0  
Total gains (losses) included in:      
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities (27.2) (17.8) $ (22.8)
Fair Value, Measurements, Recurring [Member]      
Financial assets [Abstract]      
Value before application of CME Rule 814 397.2 456.9  
Impact of CME Rule 814 (269.4) (295.0)  
Total commodity derivatives 127.8 161.9  
Financial assets 127.8 161.9  
Financial liabilities [Abstract]      
Liquidity Option 509.6 390.0  
Interest rate derivatives 13.5    
Commodity derivatives:      
Value before application of CME Rule 814 362.0 398.1  
Impact of CME Rule 814 (245.8) (235.7)  
Total commodity derivatives 116.2 162.4  
Financial liabilities 639.3 552.4  
Net value before application of CME Rule 814 to commodity hedging portfolio 35.2    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]      
Financial assets [Abstract]      
Value before application of CME Rule 814 53.4 172.3  
Impact of CME Rule 814 (47.0) (134.8)  
Total commodity derivatives 6.4 37.5  
Financial assets 6.4 37.5  
Financial liabilities [Abstract]      
Liquidity Option 0.0 0.0  
Interest rate derivatives 0.0    
Commodity derivatives:      
Value before application of CME Rule 814 88.1 85.5  
Impact of CME Rule 814 (81.9) (48.6)  
Total commodity derivatives 6.2 36.9  
Financial liabilities 6.2 36.9  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]      
Financial assets [Abstract]      
Value before application of CME Rule 814 343.7 282.4  
Impact of CME Rule 814 (222.4) (159.3)  
Total commodity derivatives 121.3 123.1  
Financial assets 121.3 123.1  
Financial liabilities [Abstract]      
Liquidity Option 0.0 0.0  
Interest rate derivatives 13.5    
Commodity derivatives:      
Value before application of CME Rule 814 273.6 291.2  
Impact of CME Rule 814 (163.9) (172.9)  
Total commodity derivatives 109.7 118.3  
Financial liabilities 123.2 118.3  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]      
Financial assets [Abstract]      
Value before application of CME Rule 814 0.1 2.2  
Impact of CME Rule 814 0.0 (0.9)  
Total commodity derivatives 0.1 1.3  
Financial assets 0.1 1.3  
Financial liabilities [Abstract]      
Liquidity Option 509.6 390.0  
Interest rate derivatives 0.0    
Commodity derivatives:      
Value before application of CME Rule 814 0.3 21.4  
Impact of CME Rule 814 0.0 (14.2)  
Total commodity derivatives 0.3 7.2  
Financial liabilities 509.9 397.2  
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward]      
Financial liability balance, net, beginning of period (395.9) [1] (332.7)  
Total gains (losses) included in:      
Transfers out of Level 3 [1] 7.6 (2.7)  
Financial liability balance, net, end of period (509.8) [1] (395.9) [1] $ (332.7)
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities 0.2 (1.2)  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Comprehensive Income (Loss) [Member]      
Total gains (losses) included in:      
Other comprehensive income (loss) (2.1) (3.2)  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Revenue [Member]      
Total gains (losses) included in:      
Net income [2] 3.7 0.7  
Settlements [2] (3.5) (1.9)  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Expense [Member]      
Total gains (losses) included in:      
Net income $ (119.6) $ (56.1)  
[1] Transfers out of Level 3 into Level 2 were due to shorter remaining transaction maturities falling inside of the Level 2 range at December 31, 2019 and 2018.
[2] There were $0.2 million of unrealized gains and $1.2 million of unrealized losses included in these amounts for the years ended December 31, 2019 and 2018, respectively.