Retirement Plans and Postretirement Benefit Plans - Defined Benefit Plan, Plan Assets, Category (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
U.S. common stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 56.9	$ 71.9
U.S. treasury notes and bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	42.4	44.6
Mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		22.0	26.2
Corporate fixed income and other securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		54.6	65.5
Commingled fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[2]	13.8	18.2
Foreign government bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0.2	0.5
Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0.3	0.9
Money Market Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		1.3	5.9
Interest and dividends receivable [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		1.4	1.6
Payable to broker for securities purchased [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		(14.2)	(25.2)
Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		55.3	60.4
Preferred Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		1.0	1.5
Cash Collateral [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0.3	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		8.3	20.6
Total Plan investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		248.2	296.0
Plan Assets Attributable to Affiliates
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		(52.3)	(54.1)
Total Plan assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		243.7	293.0
Total Plan assets [Member] | Og and E [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		191.4	238.9
Fair Value, Inputs, Level 1 [Member] | U.S. common stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		56.9	71.9
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]	42.4	44.6
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		55.3	60.4
Fair Value, Inputs, Level 1 [Member] | Preferred Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		1.0	1.5
Fair Value, Inputs, Level 1 [Member] | Cash Collateral [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0.3	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		155.9	178.7
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		22.0	26.2
Fair Value, Inputs, Level 2 [Member] | Corporate fixed income and other securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		54.6	65.5
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		0.2	0.5
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0.3	0.9
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		77.2	93.2
Net Asset Value [Member] | U.S. common stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0.0	0.0	[3]
Net Asset Value [Member] | U.S. treasury notes and bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	0.0	0.0	[3]
Net Asset Value [Member] | Mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0.0	0.0	[3]
Net Asset Value [Member] | Corporate fixed income and other securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0.0	0.0	[3]
Net Asset Value [Member] | Commingled fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[2]	13.8	18.2	[3]
Net Asset Value [Member] | Foreign government bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0.0	0.0	[3]
Net Asset Value [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0.0	0.0	[3]
Net Asset Value [Member] | Money Market Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		1.3	5.9	[3]
Net Asset Value [Member] | Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0.0	0.0	[3]
Net Asset Value [Member] | Preferred Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0.0	0.0	[3]
Net Asset Value [Member] | Cash Collateral [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0.0	0.0	[3]
Net Asset Value [Member] | Receivable (foreign currency) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0.0	0.0	[3]
Net Asset Value [Member] | Total Plan investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 15.1	$ 24.1	[3]

[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.