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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Information [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
The following table discloses information about investing and financing activities that affected recognized assets and liabilities but did not result in cash receipts or payments. Cash paid for interest, net of interest capitalized, and cash paid for income taxes, net of income tax refunds are also disclosed in the table.
Year Ended December 31 (In millions)
2018
2017
2016
NON-CASH INVESTING AND FINANCING ACTIVITIES
 
 
 
Power plant long-term service agreement
$
(9.2
)
$
(2.6
)
$
39.5

SUPPLEMENTAL CASH FLOW INFORMATION
 
 
 
Cash paid during the period for:
 
 
 
Interest (net of interest capitalized) (A)
$
153.8

$
139.6

$
141.9

Income taxes (net of income tax refunds)
$
2.8

$
(16.0
)
$
(5.9
)

(A)
Net of interest capitalized of $11.7 million, $18.0 million and $7.5 million in 2018, 2017 and 2016, respectively.