Furniture, Equipment and Leasehold Improvements, net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]
Furniture and equipment	$ 930.7	$ 932.6
Leasehold improvements	611.4	597.2
Land and buildings	109.6	109.9
Furniture, equipment and leasehold improvements	1,651.7	1,639.7
Less: Accumulated depreciation	(1,111.7)	(1,134.9)
Total furniture, equipment and leasehold improvements, net	540.0	504.8
Depreciation and amortization expense	$ 130.6	$ 124.3	$ 130.7