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Acquisitions and Divestitures (Non-cash (Decreases) Increases Related to the Simplification Transaction) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]
Noncontrolling interest		$ (4.2)
Deferred income taxes	$ (43.7)	(0.3)
Share issuances, for the acquisition of Partnership public units	0.0
Common Stock
Subsidiary, Sale of Stock [Line Items]
Share issuances, for the acquisition of Partnership public units	0.3
Additional Paid-In Capital
Subsidiary, Sale of Stock [Line Items]
Noncontrolling interest		(1.5)
Deferred income taxes	(43.7)	$ (0.3)
Share issuances, for the acquisition of Partnership public units	182.2
Simplification Transaction
Subsidiary, Sale of Stock [Line Items]
Noncontrolling interest	(182.5)
Deferred income taxes	(43.7)
Simplification Transaction | Common Stock
Subsidiary, Sale of Stock [Line Items]
Share issuances, for the acquisition of Partnership public units	0.3
Simplification Transaction | Additional Paid-In Capital
Subsidiary, Sale of Stock [Line Items]
Share issuances, for the acquisition of Partnership public units	$ 225.9

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Adjustments to Additional Paid in Capital, Adjustments to Deferred Tax Liabilities

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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