Leases Leases - Other information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 48.6
Operating cash flows from finance leases	3.5
Financing cash flows from finance leases	13.7
Leased assets obtained in exchange for new operating lease obligations	26.6
Leased assets obtained in exchange for new finance lease obligations	$ 28.6
Weighted average remaining lease term operating leases (years)	7 years 9 months 18 days
Weighted average remaining lease term finance leases (years)	5 years 2 months 12 days
Weighted average discount rate operating leases (percent)	6.70%
Weighted average discount rate finance leases (percent)	5.50%