Consolidated Statements of Cash Flows (Parenthetical) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($) hotel	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Statement of Cash Flows [Abstract]
Interest paid attributable to noncontrolling interest	$ 4.1	$ 30.5
Income taxes paid attributable to noncontrolling interest		7.0
Capitalized interest	3.8	$ 1.2
Restricted cash	$ 79.2		$ 43.6
Number of hotels securing loans | hotel	6