Leases - Cash flow information, weighted average remaining term and discount rate (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Leases
Gains on sale and leaseback transactions, net		$ (0.2)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 58.7	177.0
Right-of-use assets obtained in exchange for operating lease liabilities	$ 96.8	$ 99.1
Weighted-average remaining lease term - operating leases	25 years	25 years
Weighted-average discount rate - operating leases	6.40%	6.40%