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Operations and Significant Accounting Policies (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Inventories – Net [Abstract]    
Fuel [1] $ 39.6 $ 43.9
Materials and Supplies 48.2 48.7
Raw Materials 2.9 2.9
Work in Progress 3.5 1.0
Finished Goods 9.4 8.6
Reserve for Obsolescence (1.0) (0.9)
Total Inventories – Net 102.6 104.2
Prepayments and Other Current Assets [Abstract]    
Deferred Fuel Adjustment Clause 20.2 18.6
Restricted Cash 6.5 2.2
Other 17.5 19.5
Total Prepayments and Other Current Assets 44.2 40.3
Other Non-Current Assets [Abstract]    
Contract Payment 28.0 29.6
Finance Receivable 11.0 11.5
Restricted Cash 8.6 8.6
Other 55.4 56.8
Total Other Non-Current Assets 103.0 106.5
Other Current Liabilites [Abstract]    
PSAs 24.8 24.6
Other 59.9 49.1
Total Other Current Liabilities 84.7 73.7
Other Non-Current Liabilities [Abstract]    
Asset Retirement Obligation 157.4 136.6
PSAs 95.3 113.8
Contingent Consideration [2] 5.6 25.0
Other 42.8 47.3
Total Other Non-Current Liabilities $ 301.1 $ 322.7
[1] Fuel consists primarily of coal inventory at Minnesota Power.
[2] Contingent Consideration relates to the estimated fair value of the earnings-based payment resulting from the U.S. Water Services acquisition. (See Note 5. Fair Value.)