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Consolidated Statement of Income Consolidated Statement of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Operating Revenues [Abstract]    
Contracts with Customers - Utility $ 282.2 $ 270.2
Contracts with Customers - Non-utility 72.1 82.0
Other - Non-utility 2.9 6.0
Total Operating Revenue 357.2 358.2
Operating Expenses [Abstract]    
Fuel, Purchased Power and Gas - Utility 109.8 100.9
Transmission Services - Utility 18.3 18.4
Cost of Sales - Non-utility 30.6 32.9
Operating and Maintenance 76.2 86.5
Depreciation and Amortization 51.9 45.8
Taxes Other than Income Taxes 13.6 16.3
Total Operating Expenses 300.4 300.8
Operating Income 56.8 57.4
Other Income (Expense) [Abstract]    
Interest Expense 16.5 16.9
Equity Earnings 5.6 4.7
Gain on Sale of U.S. Water Services 20.1 0.0
Other 7.4 2.1
Total Other Expense 16.6 (10.1)
Income Before Income Taxes 73.4 47.3
Income Tax Expense (Benefit) 2.9 (3.7)
Net Income $ 70.5 $ 51.0
Earnings Per Share [Abstract]    
Basic (Shares) 51.6 51.2
Diluted (Shares) 51.7 51.4
Basic Earnings Per Share of Common Stock $ 1.37 $ 1.00
Diluted Earnings Per Share of Common Stock $ 1.37 $ 0.99