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Restructuring Charges Segments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (3,500,000)	$ 47,300,000	$ (2,400,000)	$ 159,900,000
Lease impairment costs	(3,200,000)	26,600,000	(4,200,000)	92,300,000
IAN [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(600,000)	24,900,000	0.0	93,700,000
Lease impairment costs	(2,100,000)	14,300,000	(2,800,000)	50,100,000
DXTRA [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(600,000)	17,200,000	(100,000)	53,900,000
Lease impairment costs	(1,100,000)	$ 12,800,000	(1,400,000)	$ 39,600,000
Corporate and Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (2,300,000)		$ (2,300,000)

X

- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 25
-Paragraph 6
-Subparagraph (c)
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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868

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