XML 113 R96.htm IDEA: XBRL DOCUMENT v3.25.0.1
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.