Additional Details Related to Certain Balance Sheet Captions (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Other current assets:
Prepaid taxes	$ 67.7	$ 83.3
Prepaid expenses	58.4	66.9
Other	33.5	29.4
Total other current assets	159.6	179.6
Other assets
Investments in joint ventures	16.2	28.7
Deposits for real-estate leases	11.5	11.4
Indemnification assets related to acquisitions	20.5	19.2
Mutual funds and fixed deposits	59.9	55.0
Other	50.1	26.1
Total other assets	158.2	140.4
Accounts payable and accrued liabilities
Salaries and benefits	73.7	83.0
Incentive compensation	62.8	137.2
Customer credits, advanced payments and advanced billings	25.4	24.6
Self-insurance reserves	25.1	19.7
Dividends	6.7	78.2
Professional service fees	51.8	54.5
Interest accrued on debt	56.1	59.4
Accounts payable	35.6	22.2
Income taxes	21.7	11.5
Pension and other post retirement employee benefits	6.2	6.2
Other	88.7	70.1
Total accounts payable and accrued liabilities	453.8	566.6
Other liabilities
Pension and other post retirement employee benefits	248.0	261.7
Deferred rent-non-current portion	98.0	98.4
Interest accrued on UTPs	30.9	27.9
Legacy and other tax matters	3.0	1.7
Other	24.1	27.5
Total other liabilities	$ 404.0	$ 417.2