CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Pension Plans [Member]
Pension Plan and Restoration of Retirement Income Plan:
Amortization of prior service cost, net of tax of $0.0 and $0.0, respectively	$ 0.0	$ 0.0
Amortization of deferred net loss, net of tax of $0.1 and $0.1, respectively	0.1	0.1
Settlement cost, net of tax of $0.2 and $2.2, respectively	0.2	2.2
Other Postretirement Benefits Plan [Member]
Postretirement plans:
Amortization of deferred net gain, net of tax of $0.0 and $0.0, respectively	$ 0.0	$ 0.0

-- None. No documentation exists for this element. --

No definition available.

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- Definition

Other Comprehensive Income Amortization Of Defined Benefit Pension Plans Net Prior Service Cost Recognized in Net Periodic Pension Cost, Tax

+ References

No definition available.

+ Details

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- Definition

Other comprehensive income amortization of defined benefit postretirement plans deferred net gain recognized in net periodic postretirement cost tax effect.

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

Amount of tax expense (benefit) for increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e640-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI https://asc.fasb.org/extlink&oid=126929396&loc=SL4569616-111683

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- Definition

Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

+ References

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