Accrued Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accrued Liabilities [Abstract]
Salaries, benefits and related expenses	$ 467.2	$ 478.2
Office and related expenses	56.9	51.6
Acquisition Obligations, current	12.8	29.5
Interest	16.0	42.4
Restructuring Reserve, Current	46.7	3.6
Other	118.8	122.9
Total accrued liabilities	$ 718.4	$ 728.2