Additional Details Related to Certain Balance Sheet Captions (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other current assets:
Prepaid taxes	$ 40.0	$ 31.8
Prepaid expenses	48.1	47.3
Other	26.3	12.8
Total other current assets	114.4	91.9
Other assets:
Investments in joint ventures	37.5	38.3
Deposits for real-estate leases	10.3	10.0
Other	37.3	29.0
Total other assets	112.1	96.0
Indemnification assets related to acquisitions	27.0	18.7
Accounts payable and accrued liabilities:
Salaries and benefits	77.1	79.2
Incentive compensation	135.9	162.6
Profit sharing contribution	0	12.6
Customer credits, advanced payments and advanced billings	21.7	21.5
Self-insurance reserves	27.6	55.8
Dividends	65.5	47.7
Professional service fees	32.9	30.2
Interest accrued on debt	36.3	23.4
Accounts payable	16.4	14.3
Income taxes (see Note 13)	47.5	56.1
Deferred rent-current portion	0	0
Pension and other retirement employee benefits (see Note 11)	7.0	4.4
Other	71.0	47.5
Total accounts payable and accrued liabilities	538.9	555.3
Other liabilities:
Pension and other retirement employee benefits (see Note 11)	164.0	213.3
Deferred rent-non-current portion	106.3	110.2
Legacy and other tax matters	15.4	37.1
Other	56.5	38.9
Total other liabilities	360.2	410.1
Accounts payable and accrued liabilities
Accounts payable and accrued liabilities:
Interest accrued on UTPs	0	0
Other liabilities:
Interest accrued on UTPs	0	0
Other Liabilities
Accounts payable and accrued liabilities:
Interest accrued on UTPs	18.0	10.6
Other liabilities:
Interest accrued on UTPs	$ 18.0	$ 10.6