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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.