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Information by Operating Segment - Schedule of Operating Segment Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Operating Segment Information [Abstract]          
Total Operating Revenues $ 715.5 $ 803.5 $ 1,282.4 $ 1,405.5  
Gas Utility          
Natural and propane gas 249.0 337.4 463.6 589.1  
Operation and maintenance 93.1 109.5 199.1 212.0  
Depreciation and amortization 47.0 44.4 93.4 88.1  
Taxes, other than income taxes 51.7 57.4 89.6 96.6  
Total Gas Utility Operating Expenses 440.8 548.7 845.7 985.8  
Gas Marketing and other 64.2 45.3 123.9 105.1  
Total Operating Expenses 505.0 594.0 969.6 1,090.9  
Operating Income 210.5 209.5 312.8 314.6  
Net Economic Earnings (Loss) 144.0 147.9 215.8 213.8  
Total Assets 8,018.0 7,273.6 8,018.0 7,273.6 $ 7,619.2
Eliminations          
Operating Segment Information [Abstract]          
Total Operating Revenues (11.5) (3.1) (18.7) (7.5)  
Gas Utility          
Natural and propane gas (22.6) (29.3) (49.5) (69.4)  
Operation and maintenance (2.7) (2.5) (5.3) (4.9)  
Depreciation and amortization 0.0 0.0 0.0 0.0  
Taxes, other than income taxes 0.0 0.0 0.0 0.0  
Total Gas Utility Operating Expenses (25.3) (31.8) (54.8) (74.3)  
Gas Marketing and other 13.8 28.7 36.1 66.8  
Total Operating Expenses (11.5) (3.1) (18.7) (7.5)  
Operating Income 0.0 0.0 0.0 0.0  
Net Economic Earnings (Loss) 0.0 0.0 0.0 0.0  
Total Assets (667.6) (1,340.0) (667.6) (1,340.0) (1,380.4)
Gas Utility          
Operating Segment Information [Abstract]          
Total Operating Revenues 679.1 776.7 1,209.7 1,350.5  
Gas Utility | Eliminations          
Operating Segment Information [Abstract]          
Total Operating Revenues (0.1) 0.1 0.0 1.5  
Gas Utility | Operating Segments          
Operating Segment Information [Abstract]          
Total Operating Revenues 679.0 776.8 1,209.7 1,352.0  
Gas Utility          
Natural and propane gas 271.6 366.7 513.1 658.5  
Operation and maintenance 95.8 112.0 204.4 216.9  
Depreciation and amortization 47.0 44.4 93.4 88.1  
Taxes, other than income taxes 51.7 57.4 89.6 96.6  
Total Gas Utility Operating Expenses 466.1 580.5 900.5 1,060.1  
Gas Marketing and other 0.0 0.0 0.0 0.0  
Total Operating Expenses 466.1 580.5 900.5 1,060.1  
Operating Income 212.9 196.3 309.2 291.9  
Net Economic Earnings (Loss) 144.3 146.7 213.4 213.1  
Total Assets 6,311.6 5,850.1 6,311.6 5,850.1 6,094.6
Gas Marketing          
Operating Segment Information [Abstract]          
Total Operating Revenues 33.3 25.4 65.6 51.2  
Gas Marketing | Eliminations          
Operating Segment Information [Abstract]          
Total Operating Revenues 0.0 0.1 0.0 0.1  
Gas Marketing | Operating Segments          
Operating Segment Information [Abstract]          
Total Operating Revenues 33.3 25.5 65.6 51.3  
Gas Utility          
Natural and propane gas 0.0 0.0 0.0 0.0  
Operation and maintenance 0.0 0.0 0.0 0.0  
Depreciation and amortization 0.0 0.0 0.0 0.0  
Taxes, other than income taxes 0.0 0.0 0.0 0.0  
Total Gas Utility Operating Expenses 0.0 0.0 0.0 0.0  
Gas Marketing and other 37.7 8.7 65.6 22.0  
Total Operating Expenses 37.7 8.7 65.6 22.0  
Operating Income (4.4) 16.8 0.0 29.3  
Net Economic Earnings (Loss) 5.1 6.2 11.2 14.5  
Total Assets 159.3 366.7 159.3 366.7 212.3
Corporate, Non-Segment          
Operating Segment Information [Abstract]          
Total Operating Revenues 3.1 1.4 7.1 3.8  
Corporate, Non-Segment | Eliminations          
Operating Segment Information [Abstract]          
Total Operating Revenues 11.6 2.9 18.7 5.9  
Corporate, Non-Segment | Operating Segments          
Operating Segment Information [Abstract]          
Total Operating Revenues 14.7 4.3 25.8 9.7  
Gas Utility          
Natural and propane gas 0.0 0.0 0.0 0.0  
Operation and maintenance 0.0 0.0 0.0 0.0  
Depreciation and amortization 0.0 0.0 0.0 0.0  
Taxes, other than income taxes 0.0 0.0 0.0 0.0  
Total Gas Utility Operating Expenses 0.0 0.0 0.0 0.0  
Gas Marketing and other 12.7 7.9 22.2 16.3  
Total Operating Expenses 12.7 7.9 22.2 16.3  
Operating Income 2.0 (3.6) 3.6 (6.6)  
Net Economic Earnings (Loss) (5.4) (5.0) (8.8) (13.8)  
Total Assets $ 2,214.7 $ 2,396.8 $ 2,214.7 $ 2,396.8 $ 2,692.7