Restructuring Charges (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated, Inception to Date	694		694
Severance and termination costs	$ 44,600,000	$ 2,100,000	$ 44,600,000	$ 22,000,000.0
Lease impairment costs	65,700,000	0.0	65,700,000	11,900,000
Other restructuring costs	2,300,000	0.0	2,300,000	0.0
Restructuring charges	$ 112,600,000	$ 2,100,000	$ 112,600,000	$ 33,900,000