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Restructuring Charges 2020 Plan Restructuring Activity (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Severance and termination costs	$ (2,100,000)	$ 17,900,000	$ (100,000)	$ 62,500,000
Lease impairment costs	(3,200,000)	26,600,000	(4,200,000)	92,300,000
Other restructuring costs	1,800,000	2,800,000	1,900,000	5,100,000
Restructuring charges	(3,500,000)	47,300,000	(2,400,000)	159,900,000
Restructuring Reserve	12,800,000		12,800,000		$ 74,600,000
DXTRA [Member]
Restructuring Cost and Reserve [Line Items]
Lease impairment costs	(1,100,000)	12,800,000	(1,400,000)	39,600,000
Restructuring charges	(600,000)	$ 17,200,000	(100,000)	$ 53,900,000
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	12,800,000		12,800,000		74,600,000
Lease impairment costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0.0		0.0		0.0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 0.0		0.0		$ 0.0
Non-cash Items [Member]
Restructuring Cost and Reserve [Line Items]
Severance and termination costs			300,000
Lease impairment costs			(4,200,000)
Other restructuring costs			1,700,000
Restructuring charges			(2,200,000)
Cash Payments [Member]
Restructuring Cost and Reserve [Line Items]
Severance and termination costs			61,400,000
Lease impairment costs			0.0
Other restructuring costs			200,000
Restructuring charges			$ 61,600,000

X

- Definition

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

+ References

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

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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.

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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.

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