Leases - Future Minimum Lease Payments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Operating leases
2020 (excluding the three months ended March 31, 2020)	$ 91.3
2021	114.5
2022	107.1
2023	91.1
2024	84.7
Thereafter	644.1
Total future minimum lease payments	1,132.8
Less imputed interest	(254.1)
Less tenant improvement receivables	(22.9)
Operating lease, liability	855.8
Finance leases
2020 (excluding the three months ended March 31, 2020)	67.6
2021	78.1
2022	64.0
2023	30.4
2024	1.7
Thereafter	0.0
Total future minimum lease payments	241.8
Less imputed interest	(13.9)
Less tenant improvement receivables	0.0
Finance lease, liability	227.9
Rent payments from sub-tenants	$ 31.9
Minimum
Finance leases
Rent payments from sub-tenants, term	1 year
Maximum
Finance leases
Rent payments from sub-tenants, term	4 years