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Operations and Significant Accounting Policies (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Inventories – Net [Abstract]    
Fuel [1] $ 48.3 $ 43.9
Materials and Supplies 49.0 48.7
Raw Materials 2.9 2.9
Work in Progress 1.4 1.0
Finished Goods 9.9 8.6
Reserve for Obsolescence (1.0) (0.9)
Total Inventories – Net 110.5 104.2
Prepayments and Other Current Assets [Abstract]    
Deferred Fuel Adjustment Clause 18.4 18.6
Restricted Cash 9.1 2.2
Other 18.0 19.5
Total Prepayments and Other Current Assets 45.5 40.3
Other Non-Current Assets [Abstract]    
Contract Payment 28.9 29.6
Finance Receivable 11.5 11.5
Restricted Cash 8.6 8.6
Other 56.2 56.8
Total Other Non-Current Assets 105.2 106.5
Other Current Liabilites [Abstract]    
PSAs 24.6 24.6
Contingent Consideration [2] 4.6 0.0
Other 41.4 49.1
Total Other Current Liabilities 70.6 73.7
Other Non-Current Liabilities [Abstract]    
Asset Retirement Obligation 157.2 136.6
PSAs 107.6 113.8
Contingent Consideration [3] 5.4 25.0
Other 46.7 47.3
Total Other Non-Current Liabilities $ 316.9 $ 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.)
[3] 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.)