Leases - Supplemental Cash Flow and Other Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Supplemental Cash Flow and Other Information [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	7 years 26 days
Operating Lease, Payments	$ 35.4
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 936.6	$ 0.0
Operating Lease, Weighted Average Discount Rate, Percent	8.33%
Adjustments for New Accounting Pronouncement [Member]
Supplemental Cash Flow and Other Information [Line Items]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 82.7