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Benefit Plans, Fair Values by Asset Category (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Weighted average asset allocations value [Abstract]
Fair value of plan assets	$ 381.3	$ 358.2
Equity Securities [Member]
Weighted average asset allocations value [Abstract]
Fair value of plan assets	206.7	200.0
Fixed Income Securities [Member]
Weighted average asset allocations value [Abstract]
Fair value of plan assets	116.5	99.7
Real Estate [Member]
Weighted average asset allocations value [Abstract]
Fair value of plan assets	1.0	1.0
Other [Member]
Weighted average asset allocations value [Abstract]
Fair value of plan assets	$ 57.1	$ 57.5

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(02)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

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- Details

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- Details

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- Details

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