Leases - Other (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Leases
Total undiscounted rent obligations	$ 5,514.5	$ 5,514.5
Sublease rent received	$ 5.3	16.4
Proceeds from sale-leaseback transactions		$ 7.3
Property leases | Minimum
Leases
Initial lease period (in years)	5 years	5 years
Property leases | Maximum
Leases
Initial lease period (in years)	20 years	20 years
Equipment leases | Maximum
Leases
Initial lease period (in years)	5 years	5 years