Additional Details Related to Certain Balance Sheet Captions (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other current assets
Prepaid taxes	$ 44.4	$ 40.0
Prepaid expenses	55.4	48.1
Other	19.8	26.3
Total other current assets	119.6	114.4
Other assets
Investments in joint ventures	39.9	37.5
Deposits for real-estate leases	10.5	10.3
Other	29.9	37.3
Total other assets	106.6	112.1
Indemnification assets related to acquisitions	26.3	27.0
Accounts payable and accrued liabilities
Salaries and benefits	79.2	77.1
Incentive compensation	30.3	135.9
Customer credits, advanced payments and advanced billings	4.0	21.7
Dividends	4.1	65.5
Professional service fees	39.1	32.9
Interest accrued on debt	8.9	36.3
Accounts payable	16.5	16.4
Income taxes	0.4	47.5
Pension and other post retirement employee benefits	7.1	7.0
Other	95.7	71.0
Total accounts payable and accrued liabilities	312.4	538.9
Self-insurance reserves	27.1	27.6
Other liabilities
Pension and other post retirement employee benefits	170.1	164.0
Deferred rent-non-current portion	108.2	106.3
Interest accrued on UTPs	14.9	18.0
Legacy and other tax matters	15.5	15.4
Other	46.3	56.5
Total other liabilities	$ 355.0	$ 360.2