Consolidated Statements of Operations (Unaudited) Consolidated Statements of Operations (Parenthetical) (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Investment management, property services, and research fees— related party	$ 6.2	$ 15.7	$ 47.0	$ 37.8