Favorable and Unfavorable Acquired Lease Contracts, net - Future Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 15.1	$ 15.2	$ 16.8
Weighted Average Life (Years)	11 years 1 month 6 days
Expected future amortization of lease contract rights
2016	$ 14.6
2017	7.2
2018	5.3
2019	5.2
2020	5.2
2021 and Thereafter	38.4
Acquired Intangible Assets, Net	75.9	91.0
Expected future (accretion) of lease contract rights
2016	(10.1)
2017	(9.0)
2018	(7.3)
2019	(4.8)
2020	(3.7)
2021 and Thereafter	(15.4)
Total acquired fair value of lease contracts, net	(50.3)	$ (61.4)
Expected future amortization (accretion) of lease contract rights
2016	(1.9)
2017	(2.6)
2018	(3.3)
2019	(1.2)
2020	(0.6)
2021 and Thereafter	(2.6)
Total	$ (12.2)
Favorable
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	11 years 1 month 6 days	10 years 9 months 18 days	10 years 1 month 6 days
Expected future amortization of lease contract rights
2016	$ 8.2
2017	6.4
2018	4.0
2019	3.6
2020	3.1
2021 and Thereafter	12.8
Acquired Intangible Assets, Net	38.1	$ 48.3
(Unfavorable)
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 0.9	$ 1.0	$ 4.3
Weighted Average Life (Years)	10 years 1 month 6 days	9 years 9 months 18 days	8 years 10 months 24 days