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Restructuring Charges 2020 Plan Restructuring Activity (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Severance and termination costs	$ 600,000	$ 44,600,000	$ 2,100,000	$ 44,600,000
Lease impairment costs	(900,000)	65,700,000	(1,100,000)	65,700,000
Other restructuring costs	100,000	2,300,000	100,000	2,300,000
Restructuring charges	(200,000)	$ 112,600,000	1,100,000	112,600,000
Restructuring Reserve	23,800,000		23,800,000		$ 74,600,000
DXTRA [Member]
Restructuring Cost and Reserve [Line Items]
Lease impairment costs	(300,000)		(300,000)	26,800,000
Restructuring charges	(300,000)		500,000	$ 36,700,000
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	23,800,000		23,800,000		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			(1,100,000)
Other restructuring costs			(100,000)
Restructuring charges			(900,000)
Cash Payments [Member]
Restructuring Cost and Reserve [Line Items]
Severance and termination costs			52,600,000
Lease impairment costs			0.0
Other restructuring costs			200,000
Restructuring charges			$ 52,800,000

X

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

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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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