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Risk Management (Notional Amounts and Terms of Company's Derivative Financial Instruments) (Details)
bcf in Millions, MMBbls in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
MMBbls
bcf
Dec. 31, 2018
USD ($)
MMBbls
bcf
Dec. 31, 2017
USD ($)
Derivative [Line Items]      
Product revenues $ 252.3 $ 343.3 $ 234.1
Cash collateral received, net 16.9 14.2  
Commodity Contract With Credit Contingent Features      
Derivative [Line Items]      
Aggregate fair value of commodity derivative instruments 1.6 2.2  
NYMEX-related net derivative liability position      
Derivative [Line Items]      
Derivative Liability 28.8 9.4  
NYMEX-related cash collateral posted      
Derivative [Line Items]      
NYMEX margin deposit 40.4 21.7  
Commodity Contract      
Derivative [Line Items]      
Gain (loss) reflected in costs of product/services sold 19.5 29.6 $ (31.2)
Cash collateral received, net $ 0.1 $ 0.1  
Propane, ethane, butane, heating oil and crude oil (MMBbls) | Fixed Price Payor      
Derivative [Line Items]      
Notional amount | MMBbls 33.5 27.8  
Propane, ethane, butane, heating oil and crude oil (MMBbls) | Fixed Price Receiver      
Derivative [Line Items]      
Notional amount | MMBbls 36.6 30.1  
Natural gas (Bcf) | Fixed Price Payor      
Derivative [Line Items]      
Notional amount | bcf 3.7 1.8  
Natural gas (Bcf) | Fixed Price Receiver      
Derivative [Line Items]      
Notional amount | bcf 8.7 1.8