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Discontinued Operations - Narrative (Details) - Natural Gas Marketing - Discontinued Operations, Disposed of by Sale - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 01, 2017
Jan. 31, 2018
Mar. 31, 2017
Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Cash purchase price $ 38.3      
Working capital 109.0      
Total consideration 147.3      
Escrow deposit $ 7.0      
Escrow released   $ 3.0    
Net gain per diluted share (USD per share)     $ 0.03  
Pretax gain recognized       $ 10.6
Cash flow hedge ineffectiveness       3.4
Decrease in purchased gas cost       $ 6.8