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Pensions and Postretirement Benefits Other Than Pensions (Schedule of Fair Values of Company's Pension Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Defined benefit plan, fair value of pension plan assets	$ 2,010.2	$ 2,145.7
Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	6.5	4.7
Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	1,430.4	1,497.5
Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	117.7	120.9
Net Assets, Segment [Member]
Defined benefit plan, fair value of pension plan assets	490.6	512.2
Registered mutual funds, fixed income specialty [Member]
Defined benefit plan, fair value of pension plan assets	91.7	96.1
Registered mutual funds, fixed income specialty [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Registered mutual funds, fixed income specialty [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Registered mutual funds, fixed income specialty [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
U.S. Government and Agency Obligations [Member]
Defined benefit plan, fair value of pension plan assets	384.1	355.7
U.S. Government and Agency Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
U.S. Government and Agency Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	384.1	355.7
U.S. Government and Agency Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Corporate and Non-U.S. Bonds [Member]
Defined benefit plan, fair value of pension plan assets	1,001.9	1,079.5
Corporate and Non-U.S. Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Corporate and Non-U.S. Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	1,001.9	1,079.5
Corporate and Non-U.S. Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Asset-Backed And Mortgage-Backed Securities [Member]
Defined benefit plan, fair value of pension plan assets	14.9	12.5
Asset-Backed And Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Asset-Backed And Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	14.9	12.5
Asset-Backed And Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Commingled Funds - Fixed Income Specialty [Member]
Defined benefit plan, fair value of pension plan assets	81.0	75.0
Commingled Funds - Fixed Income Specialty [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Commingled Funds - Fixed Income Specialty [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Commingled Funds - Fixed Income Specialty [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Other Fixed Income [Member]
Defined benefit plan, fair value of pension plan assets	31.5	31.2
Other Fixed Income [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Other Fixed Income [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Other Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	31.5	31.2
Derivative [Member]
Defined benefit plan, fair value of pension plan assets	(0.5)	5.9
Derivative [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Derivative [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	(0.5)	5.9
Derivative [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Derivative [Member] | Net Assets, Segment [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Other Defined Benefit [Member]
Defined benefit plan, fair value of pension plan assets	86.2	89.7
Other Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Other Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Other Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	86.2	89.7
Other Defined Benefit [Member] | Net Assets, Segment [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Cash and Cash Equivalents [Member]
Defined benefit plan, fair value of pension plan assets	36.5	48.6
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	6.5	4.7
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	30.0	43.9
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Cash and Cash Equivalents [Member] | Net Assets, Segment [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Registered mutual funds, equity specialty [Member]
Defined benefit plan, fair value of pension plan assets	73.7	78.7
Registered mutual funds, equity specialty [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Registered mutual funds, equity specialty [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Registered mutual funds, equity specialty [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Commingled funds, equity specialty [Member]
Defined benefit plan, fair value of pension plan assets	244.2	262.4
Commingled funds, equity specialty [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Commingled funds, equity specialty [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Commingled funds, equity specialty [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Receivables and Payables
Defined benefit plan, fair value of pension plan assets	(35.0)	10.4
Registered mutual funds, equity specialty [Member] | Net Assets, Segment [Member]
Defined benefit plan, fair value of pension plan assets	73.7	78.7
Equity Securities [Member]
Defined benefit plan, fair value of pension plan assets	317.9	341.1
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Equity Securities [Member] | Net Assets, Segment [Member]
Defined benefit plan, fair value of pension plan assets	317.9	341.1
Commingled funds, equity specialty [Member] | Net Assets, Segment [Member]
Defined benefit plan, fair value of pension plan assets	244.2	262.4
Fixed Income Investments [Member]
Defined benefit plan, fair value of pension plan assets	1,605.1	1,650.0
Fixed Income Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Fixed Income Investments [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of pension plan assets	1,400.9	1,447.7
Fixed Income Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of pension plan assets	31.5	31.2
Fixed Income Investments [Member] | Net Assets, Segment [Member]
Defined benefit plan, fair value of pension plan assets	172.7	171.1
Fixed Income Investments [Member] | Registered mutual funds, fixed income specialty [Member] | Net Assets, Segment [Member]
Defined benefit plan, fair value of pension plan assets	91.7	96.1
Fixed Income Investments [Member] | U.S. Government and Agency Obligations [Member] | Net Assets, Segment [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Fixed Income Investments [Member] | Corporate and Non-U.S. Bonds [Member] | Net Assets, Segment [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Fixed Income Investments [Member] | Asset-Backed And Mortgage-Backed Securities [Member] | Net Assets, Segment [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Fixed Income Investments [Member] | Commingled Funds - Fixed Income Specialty [Member] | Net Assets, Segment [Member]
Defined benefit plan, fair value of pension plan assets	81.0	75.0
Fixed Income Investments [Member] | Other Fixed Income [Member] | Net Assets, Segment [Member]
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Defined Benefit Plan Fair Value of Plan Assets Measured Using Net Asset Value [Member]
Defined benefit plan, fair value of pension plan assets	$ 2,045.2	$ 2,135.3

X

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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