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Retirement Plans - Target and Weighted Average Actual Allocations and Benefit Pension Plans (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation (as a percent)	100.00%	100.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation (as a percent)	63.00%	60.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation (as a percent)	28.00%	31.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Actual Allocation (as a percent)	9.00%	9.00%
Defined Benefit Pension Plans | Minimum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation (as a percent)	55.00%
Defined Benefit Pension Plans | Minimum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation (as a percent)	25.00%
Defined Benefit Pension Plans | Minimum | Other
Defined Benefit Plan Disclosure [Line Items]
Target Allocation (as a percent)	0.00%
Defined Benefit Pension Plans | Maximum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation (as a percent)	65.00%
Defined Benefit Pension Plans | Maximum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation (as a percent)	35.00%
Defined Benefit Pension Plans | Maximum | Other
Defined Benefit Plan Disclosure [Line Items]
Target Allocation (as a percent)	10.00%
Defined Benefit Pension Plans | Maximum | Common or collective trusts
Defined Benefit Plan Disclosure [Line Items]
Redemption notice period to redeem investments	30 days

X

- Definition

Represents redemption notice period to redeem investments in common or collective trusts, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

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+ References

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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