Impairment Losses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2014 property	Jun. 30, 2014 property	Mar. 31, 2014 property	Sep. 30, 2013 property	Dec. 31, 2013 property	Sep. 30, 2014 property	Sep. 30, 2013 property	Dec. 31, 2014 item	Dec. 31, 2013 property
Long Lived Assets Held-for-sale [Line Items]
Percentage of shortfall on cash flow or operating performance to determine significant underperformance	15.00%
Assumed holding period for core assets	10 years
Impairment loss on hotels held for sale	$ 1.0			$ 0.2		$ 2.0	$ 0.7
Impairment losses on hotels held for use							0.2
Impairment losses on hotels sold						0.3	1.0
Number of hotels held for use with impairment recovery			1				1
Number of held for sale hotels, recorded for impairment	6					6	1
Number of hotels reclassified as held for sale		3	1
Number of held for sale hotels with impairment recovery						1
Asset Impairment Recovery on hotels held for sale						0.4
Asset Impairment Recovery on hotels held for use			0.1
Asset Impairment Recovery on hotels sold				$ 0.1		$ 0.4	$ 0.2
Number of hotels sold	4				7	10		10	17
Number of hotels sold with impairment recovery at sale	2			4		3	5
Number of hotels sold with impairment at sale				1		3	8
Minimum [Member]
Long Lived Assets Held-for-sale [Line Items]
Assumption used to determine impairment loss for non-core assets, holding period	3 years
Maximum [Member]
Long Lived Assets Held-for-sale [Line Items]
Assumption used to determine impairment loss for non-core assets, holding period	5 years