Leases - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 lease	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Lessee, Lease, Description [Line Items]
Number of leases | lease	1,400
Remaining lease term	20 years
Weighted-average remaining term of operating leases	4 years 8 months 12 days
Weighted-average discount rate of operating leases (as a percent)	6.40%
Rent expense | $		$ 143.3	$ 135.4