Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_SeveranceCosts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Restructuring and Related Charges (Narratives) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended	24 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2021
Restructuring Cost And Reserve [Line Items]
Restructuring charges, net of reversals and impairment	$ 0.3		$ 0.6
Facility related charges	$ 0.3		$ 0.6
Reduction-in-force
Restructuring Cost And Reserve [Line Items]
Reduction in force or severance and benefits						$ 9.6
Prior Year Reduction-in-force Plans
Restructuring Cost And Reserve [Line Items]
Restructuring charges, net of reversals and impairment		$ 0.7		$ 1.7
Reduction in force or severance and benefits					$ 9.2
Charges for impairment of right-of-use assets		0.3		0.6
Severance and benefits charges		$ 0.4		$ 1.1