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Assets and Liabilities Held for Sale Assets and Liabilites Held for Sale (Tables) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Assets and Liabilities Held for Sale [Line Items] |  |  |  |
Gain (Loss) on Sale of Assets and Asset Impairment Charges |  | $ (280.2) | $ 0.0 |
Assets held for sale |  | 1,655.8 |  | $ 0.0
Liabilities held for sale |  | 470.9 |  | $ 0.0
Massachusetts Business |  |  |  |
Assets and Liabilities Held for Sale [Line Items] |  |  |  |
Assets Held for Sale Net Property, Plant and Equipment |  | 1,641.2 |  |
Assets Held for Sale Total Current Assets |  | 200.4 |  |
Assets Held for Sale Total Other Assets |  | 88.7 |  |
Gain (Loss) on Sale of Assets and Asset Impairment Charges | [1] | (274.5) |  |
Assets held for sale |  | 1,655.8 |  |
Liabilities Held for Sale Long Term Debt |  | 42.4 |  |
Liabilities Held for Sale Total Current Liabilities |  | 78.9 |  |
Liabilities Held for Sale Total Other Liabilities |  | 349.6 |  |
Liabilities held for sale |  | $ 470.9 |  |
[1] | (1) Amount differs from that presented in the Condensed Statements of Consolidated Income (unaudited) due to cash already paid for certain transaction costs.

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