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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, 2021
USD ($)
bcf
MMBbls
Dec. 31, 2020
USD ($)
bcf
MMBbls
Dec. 31, 2019
USD ($)
Derivative [Line Items]      
Product revenues $ 486.7 $ 214.3 $ 252.3
Cash collateral received, net 11.4 12.4  
Commodity Contract      
Derivative [Line Items]      
Gain (loss) reflected in product costs (44.5) (20.7) $ 19.5
Cash collateral received, net 1.5 0.1  
Commodity Contract With Credit Contingent Features      
Derivative [Line Items]      
Aggregate fair value of commodity derivative instruments 57.9 38.5  
Broker-related net derivative asset position      
Derivative [Line Items]      
Broker-related cash collateral received 104.8 35.9  
Broker-related cash collateral received      
Derivative [Line Items]      
Broker-related net derivative asset position $ 76.8 $ 18.3  
Propane, ethane, butane, heating oil and crude oil (MMBbls) | Fixed Price Payor      
Derivative [Line Items]      
Notional amount | MMBbls 71.6 72.7  
Propane, ethane, butane, heating oil and crude oil (MMBbls) | Fixed Price Receiver      
Derivative [Line Items]      
Notional amount | MMBbls 75.8 76.5  
Natural gas (Bcf) | Fixed Price Payor      
Derivative [Line Items]      
Notional amount | bcf 31.9 22.6  
Natural gas (Bcf) | Fixed Price Receiver      
Derivative [Line Items]      
Notional amount | bcf 43.4 28.6