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Assets and Liabilities Held for Sale (Tables) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Assets and Liabilities Held for Sale [Line Items] |  |  |
Assets held for sale |  | $ 1,565.7 | $ 0.0
Liabilities held for sale |  | 451.8 | $ 0.0
Massachusetts Business |  |  |
Assets and Liabilities Held for Sale [Line Items] |  |  |
Assets Held for Sale Net Property, Plant and Equipment |  | 1,705.0 |
Assets Held for Sale Total Current Assets |  | 161.5 |
Assets Held for Sale Total Other Assets |  | 91.8 |
Gain (Loss) on Sale of Assets and Asset Impairment Charges | [1] | (392.6) |
Assets held for sale |  | 1,565.7 |
Liabilities Held for Sale Long Term Debt |  | 41.6 |
Liabilities Held for Sale Total Current Liabilities |  | 60.1 |
Liabilities Held for Sale Total Other Liabilities |  | 350.1 |
Liabilities held for sale |  | $ 451.8 |
[1] | (1) Amount differs from that presented in the Condensed Statements of Consolidated Income (Loss) (unaudited) due to cash already paid for certain transaction costs.

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