Company Information and Significant Accounting Policies Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2014 hotel	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Significant Accounting Policies [Line Items]
Deferred financing fees, net		$ 9.9	$ 9.4
Accounts Payable [Member]
Significant Accounting Policies [Line Items]
Book overdrafts		3.9	$ 5.4
MainStay Suites [Member]
Significant Accounting Policies [Line Items]
Company-owned hotels approved to be sold | hotel	3
Company-owned hotels | hotel	3
International [Member] | Cash and Cash Equivalents [Member]
Significant Accounting Policies [Line Items]
International cash		$ 180.0