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Segments (Narrative) (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                        
Interest, Taxes, Depreciation and Amortization included in Earnings from Equity Method Investments $ 2.6       $ 3.1         $ 86.1 $ 7.6 $ 2.6
Concentration Risk, Percentage                   10.00%    
Revenues 536.0 $ 629.1 $ 630.7 $ 641.5 731.5 $ 994.9 $ 1,033.8 $ 923.9 $ 964.9 $ 2,632.8 3,917.5 1,412.6
Tesoro                        
Segment Reporting Information [Line Items]                        
Revenues                   465.2    
Crestwood Equity Partners LP                        
Segment Reporting Information [Line Items]                        
Interest, Taxes, Depreciation and Amortization included in Earnings from Equity Method Investments 2.6       3.1         86.1 7.6 2.6
Revenues $ 536.0 $ 629.1 $ 630.7 $ 641.5 $ 731.5 $ 997.2 $ 1,036.2 $ 926.3 $ 971.6 $ 2,632.8 $ 3,931.3 $ 1,426.7