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Derivative Instruments and Hedging Activities - Pro Forma Impact Of Offsetting Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Derivative Asset [Abstract]    
Gross asset $ 165.3 $ 138.8
Gross asset 165.3 138.8
Pro forma net presentation, asset, total 108.1 79.8
Counterparties with Offsetting Positions or Collateral [Member]    
Derivative Asset [Abstract]    
Gross asset 140.4 133.1
Pro forma net presentation, asset 83.2 74.1
Counterparties without Offsetting Position [Member]    
Derivative Asset [Abstract]    
Gross asset 24.9 5.7
Pro forma net presentation, asset, total 24.9 5.7
Current Assets from Risk Management Activities [Member]    
Derivative Asset [Abstract]    
Gross asset 122.0 103.3
Pro forma net presentation, asset, current 89.7 59.5
Current Assets from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member]    
Derivative Asset [Abstract]    
Gross asset 108.9 99.8
Pro forma net presentation, asset 76.6 56.0
Current Assets from Risk Management Activities [Member] | Counterparties without Offsetting Position [Member]    
Derivative Asset [Abstract]    
Gross asset 13.1 3.5
Pro forma net presentation, asset, current 13.1 3.5
Long-Term Assets from Risk Management Activities [Member]    
Derivative Asset [Abstract]    
Gross asset 43.3 35.5
Pro forma net presentation, asset, noncurrent 18.4 20.3
Long-Term Assets from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member]    
Derivative Asset [Abstract]    
Gross asset 31.5 33.3
Pro forma net presentation, asset 6.6 18.1
Long-Term Assets from Risk Management Activities [Member] | Counterparties without Offsetting Position [Member]    
Derivative Asset [Abstract]    
Gross asset 11.8 2.2
Pro forma net presentation, asset, noncurrent $ 11.8 $ 2.2