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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2019
Fair Value Disclosures [Abstract]  
Schedule of Fair Value and Carrying Amount of PRM Financial Instruments [Table Text Block] The following table summarizes the carrying amount and fair value of the Company's financial instruments at September 30, 2019 and December 31, 2018, as well as the classification level within the fair value hierarchy.
 
September 30,
December 31,
 
 
2019
2018
 
(In millions)
Carrying Amount 
Fair
Value
Carrying Amount 
 Fair
Value
Classification
Long-term Debt (including Long-term Debt due within one year):
 
 
 
 
 
Senior Notes
$
3,049.7

$
3,580.0

$
3,001.9

$
3,178.2

Level 2
OG&E Industrial Authority Bonds
$
135.4

$
135.4

$
135.4

$
135.4

Level 2
Tinker Debt
$
9.6

$
10.3

$
9.6

$
8.7

Level 3