Intangibles - (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period for lease intangibles	20 years
Weighted average amortization period for lease intangible liability	21 years
In-place leases
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets	$ (9.6)
Impairment of intangible assets, finite-lived, lease termination	6.6
Impairment of intangible assets, finite-lived, accumulated amortization	$ 11.9