Pension And Other Benefit Plans - Changes in Fair Value of Plan Assets (Details) - Defined benefit pension plans - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Fair Value, Plan Assets Measured on Recurring Basis [Roll Forward]
Fair value of plan assets at beginning of year	$ 82.7	$ 69.2
Return on Plan Assets	10.1	5.4
Net Purchases/(Settlements)	(14.0)	8.1
Transfers Into/(Out of) Level 3	0.0	0.0
Fair value of plan assets at end of year	$ 78.8	$ 82.7

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Return on Plan Assets

No definition available.

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Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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- Definition

Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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- Details

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