Leases - Weighted Average (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating lease liabilities arising from obtaining right-of-use assets, including impact of ASC 842 adoption	$ 8.5	$ 55.7
Finance lease liabilities arising from obtaining right-of-use assets, including impact of ASC 842 adoption	$ 0.0	$ 39.6
Weighted-average remaining lease term (in years):
Operating leases	5 years 7 months 6 days	5 years 7 months 6 days
Finance leases	19 years 4 months 24 days	19 years 4 months 24 days
Weighted-average discount rate:
Operating leases	6.55%	6.55%
Finance leases	6.53%	6.53%