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Segment Information, Other Financial Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Other financial information [Abstract]      
Total assets $ 14,753.2 [1] $ 13,653.8 [2] $ 14,388.6
Goodwill 256.6 369.0 $ 256.6
Capital expenditures 558.0 174.6  
Operating Segments [Member] | Gathering and Processing [Member]      
Other financial information [Abstract]      
Total assets 10,908.5 [1] 10,780.4 [2]  
Goodwill 256.6 369.0  
Capital expenditures 273.2 139.2  
Operating Segments [Member] | Logistics and Marketing [Member]      
Other financial information [Abstract]      
Total assets 3,595.1 [1] 2,687.2 [2]  
Capital expenditures 251.0 34.6  
Operating Segments [Member] | Other Segment [Member]      
Other financial information [Abstract]      
Total assets 103.0 [1] 44.9 [2]  
Operating Segments [Member] | Corporate and Eliminations [Member]      
Other financial information [Abstract]      
Total assets 146.6 [1] 141.3 [2]  
Capital expenditures $ 33.8 $ 0.8  
[1] Assets in the Corporate and Eliminations column primarily include tax-related assets, cash, prepaids and debt issuance costs for our revolving credit facilities.
[2] Assets included in the Corporate and Eliminations column primarily include tax-related assets, cash, prepaids and debt issuance costs for our revolving credit facilities.