Segments (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019	Dec. 31, 2019 segment	Dec. 31, 2019 reporting_units	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Revenue, Major Customer [Line Items]
Revenues	$ 3,181.9				$ 3,654.1	$ 3,880.9
Number of operating segments			3	3
Concentration Risk, Percentage		10.00%			10.00%	10.00%
Crestwood Equity Partners LP
Revenue, Major Customer [Line Items]
Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization from Equity Method Investments	42.1				$ 42.3	$ 32.5
CMLP
Revenue, Major Customer [Line Items]
Revenues	3,181.9				$ 3,654.1	$ 3,880.9
British Petroleum and its subsidiaries
Revenue, Major Customer [Line Items]
Revenues	$ 333.9