Property And Equipment (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 105.8	$ 106.5	$ 107.9
Amortization expense on computer software and leasehold improvements	409.8	367.8	351.8
Computer software amortization	366.7	329.2	313.6
Capitalized costs related to the internal development of software	2,024.7	1,844.2
Computer software impairment	1.8	7.9	47.7
Continuing Operations
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 105.8	$ 106.5	$ 105.3