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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Schedule of Fair Value and Carrying Amount of PRM Financial Instruments [Table Text Block]
The following table summarizes the fair value and carrying amount of the Company's financial instruments at March 31, 2019 and December 31, 2018.
 
March 31,
December 31,
 
2019
2018
(In millions)
Carrying Amount 
Fair
Value
Carrying Amount 
 Fair
Value
Long-term Debt (including Long-term Debt due within one year):
 
 
 
 
Senior Notes
$
2,752.3

$
2,989.5

$
3,001.9

$
3,178.2

OG&E Industrial Authority Bonds
$
135.4

$
135.4

$
135.4

$
135.4

Tinker Debt
$
9.6

$
9.1

$
9.6

$
8.7