Other Assets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other Assets [Abstract]
Goodwill	$ 23.9	$ 23.9
Loan fees, net of accumulated amortization of $5.2 million and $4.5 million at March 31, 2014 and December 31, 2013, respectively	22.9	14.1
Accumulated amortization, loan fees	5.2	4.5
Deposits and other, net of accumulated amortization of $1.5 million and $1.2 million at March 31, 2014 and December 31, 2013, respectively	11.8	13.0
Accumulated amortization, deposits and other	1.3	1.2
Prepaid expenses	9.0	7.6
Marketable securities	8.5	4.0
Other Assets	105.1	73.0
Furniture and Fixtures [Member]
Other Assets [Abstract]
Office furniture and equipment net of accumulated depreciation of $2.5 million and $2.2 million at March 31, 2014 and December 31, 2013, respectively	9.6	10.4
Accumulated amortization, office furniture and equipment	2.5	2.2
Above Market Leases [Member]
Other Assets [Abstract]
Above-market leases	$ 19.4	$ 0