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Acquisitions and Divestitures (Non-cash (Decreases) Increases Related to the Simplification Transaction) (Details) - USD ($) $ in Millions | 12 Months Ended
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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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