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Acquisitions and Divestitures (Schedules) (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 09, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Investments in unconsolidated affiliates   $ 155.8 $ 943.7  
Gain on acquisition   0.0 0.0 $ 209.4
Revenues       3,202.6
Net income       313.5
CMLP        
Business Acquisition [Line Items]        
Investments in unconsolidated affiliates   155.8 943.7  
Gain on acquisition   0.0 0.0 209.4
Revenues       3,202.6
Net income       304.2
Jackalope Gas Gathering Services, LLC        
Business Acquisition [Line Items]        
Investments in unconsolidated affiliates   $ 0.0 $ 0.0  
Jackalope Gas Gathering Services, LLC        
Business Acquisition [Line Items]        
Cash $ 22.5      
Other current assets 30.9      
Property, plant and equipment 532.9      
Intangible assets 306.0      
Goodwill 80.3      
Current liabilities (30.4)      
Other long-term liabilities (21.5)      
Estimated fair value of 100% interest in Jackalope 920.7      
Gain on acquisition 209.4     $ 209.4
Total purchase price 484.6      
Jackalope Gas Gathering Services, LLC | Jackalope Gas Gathering Services, LLC        
Business Acquisition [Line Items]        
Investments in unconsolidated affiliates $ 226.7