Commitments and Contingencies Operating Leases Disclosures - ASC 842 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Leases [Abstract]
Earnest Money Deposits and Pre-acquisition Costs Written-Off	$ 0.0	$ 0.1	$ 0.5	$ 0.2
Short-term Lease, Cost	0.1		0.3
Operating Lease, Expense	0.3		0.9
Operating Lease, Payments	$ 0.3		$ 0.9
Operating Lease, Weighted Average Remaining Lease Term	3 years 6 months		3 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent	5.22%		5.22%