Accrued Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accrued Liabilities [Abstract]
Salaries, benefits and related expenses	$ 333.2	$ 467.2
Office and related expenses	54.8	56.9
Acquisition obligations	56.6	12.8
Interest	16.1	16.0
Restructuring and other reorganization-related	17.1	46.7
Other	109.6	118.8
Total accrued liabilities	$ 587.4	$ 718.4