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Retirement Plans and Postretirement Benefit Plans - Defined Benefit Plan, Plan Assets, Category (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
U.S. common stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | $ 55.7 | $ 56.9
U.S. treasury notes and bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [1] | 49.3 | 42.4
Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 23.9 | 22.0
Corporate fixed income and other securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 50.3 | 54.6
Commingled fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [2] | 13.4 | 13.8
Foreign government bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.3 | 0.2
Municipal Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.1 | 0.3
Money Market Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.9 | 1.3
Interest and dividends receivable [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 1.5 | 1.4
Payable to broker for securities purchased [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | (20.3) | (14.2)
Mutual Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 62.0 | 55.3
Preferred Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.5 | 1.0
Cash Collateral [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.1 | 0.3
Receivable (foreign currency) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.1 | 0.1
Receivable from broker for securities sold [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 9.1 | 8.3
Total Plan investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 256.6 | 248.2
Plan Assets Attributable to Affiliates |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | (35.3) | (52.3)
Total Plan assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 246.9 | 243.7
Total Plan assets [Member] | Og and E [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 211.6 | 191.4
Fair Value, Inputs, Level 1 [Member] | U.S. common stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 55.7 | 56.9
Fair Value, Inputs, Level 1 [Member] | U.S. treasury notes and bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [1] | 49.3 | 42.4
Fair Value, Inputs, Level 1 [Member] | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Corporate fixed income and other securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Commingled fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [2] | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Foreign government bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Municipal Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 62.0 | 55.3
Fair Value, Inputs, Level 1 [Member] | Preferred Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.5 | 1.0
Fair Value, Inputs, Level 1 [Member] | Cash Collateral [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.1 | 0.3
Fair Value, Inputs, Level 1 [Member] | Receivable (foreign currency) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Total Plan investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 167.6 | 155.9
Fair Value, Inputs, Level 2 [Member] | U.S. common stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | U.S. treasury notes and bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [1] | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 23.9 | 22.0
Fair Value, Inputs, Level 2 [Member] | Corporate fixed income and other securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 50.3 | 54.6
Fair Value, Inputs, Level 2 [Member] | Commingled fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [2] | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Foreign government bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.3 | 0.2
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.1 | 0.3
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Preferred Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Cash Collateral [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Receivable (foreign currency) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0.1 | 0.1
Fair Value, Inputs, Level 2 [Member] | Total Plan investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 74.7 | 77.2
Net Asset Value [Member] | U.S. common stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [3] | 0.0 | 0.0
Net Asset Value [Member] | U.S. treasury notes and bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [1],[3] | 0.0 | 0.0
Net Asset Value [Member] | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [3] | 0.0 | 0.0
Net Asset Value [Member] | Corporate fixed income and other securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [3] | 0.0 | 0.0
Net Asset Value [Member] | Commingled fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [2],[3] | 13.4 | 13.8
Net Asset Value [Member] | Foreign government bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [3] | 0.0 | 0.0
Net Asset Value [Member] | Municipal Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [3] | 0.0 | 0.0
Net Asset Value [Member] | Money Market Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [3] | 0.9 | 1.3
Net Asset Value [Member] | Mutual Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [3] | 0.0 | 0.0
Net Asset Value [Member] | Preferred Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [3] | 0.0 | 0.0
Net Asset Value [Member] | Cash Collateral [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [3] | 0.0 | 0.0
Net Asset Value [Member] | Receivable (foreign currency) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [3] | 0.0 | 0.0
Net Asset Value [Member] | Total Plan investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | [3] | $ 14.3 | $ 15.1
[1] | This category represents U.S. Treasury notes and bonds with a Moody's Investors Service rating of Aaa and Government Agency Bonds with a Moody's Investors Service rating of A1 or higher.
[2] | This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.
[3] | GAAP allows the measurement of certain investments that do not have a readily determinable fair value at the net asset value. These investments do not consider the observability of inputs; therefore, they are not included within the fair value hierarchy.

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