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Restructuring and Related Activities (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($) ft²	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) ft² numberOfPeople	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Severance and termination costs									$ 140,400,000	$ 22,000,000.0	$ 0.0
Lease Restructuring Cost									256,000,000.0	11,900,000	0.0
Other Restructuring Costs									17,400,000	0.0	0.0
Restructuring Charges	$ 253,900,000	$ 47,300,000	$ 112,600,000	$ 0.0	$ 0.0	$ 0.0	$ 2,100,000	$ 31,800,000	413,800,000	$ 33,900,000	$ 0.0
Restructuring Reserve	$ 74,600,000								$ 74,600,000
Restructuring and Related Cost, Number of Positions Eliminated | numberOfPeople									1,520
Restructuring and Related Cost, Number of Positions Eliminated, Inception to Date Percent	3.00%								3.00%
Area of Real Estate Property | ft²	1,700,000								1,700,000
IAN
Restructuring Cost and Reserve [Line Items]
Lease Restructuring Cost									$ 190,400,000
Restructuring Charges									317,900,000
DXTRA
Restructuring Cost and Reserve [Line Items]
Lease Restructuring Cost									59,800,000
Restructuring Charges									78,800,000
Non-cash Items [Member]
Restructuring Cost and Reserve [Line Items]
Severance and termination costs									4,500,000
Lease Restructuring Cost									256,000,000.0
Other Restructuring Costs									5,100,000
Restructuring Charges									265,600,000
Cash Payments [Member]
Restructuring Cost and Reserve [Line Items]
Severance and termination costs									61,300,000
Lease Restructuring Cost									0.0
Other Restructuring Costs									12,300,000
Restructuring Charges									73,600,000
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 74,600,000								74,600,000
Lease impairment costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0.0								0.0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 0.0								$ 0.0

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