Additional Details Related to Certain Balance Sheet Captions (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Other current assets:
Prepaid taxes	$ 121.9	$ 47.0
Prepaid expenses	61.1	65.7
Fair value of Bureau van Dijk purchase price hedge	59.3	7.6
Other	51.2	28.1
Total other current assets	275.4	140.8
Other assets
Investments in joint ventures	80.7	26.3
Deposits for real-estate leases	11.0	10.8
Indemnification assets related to acquisitions	16.9	16.5
Mutual funds and fixed deposits	34.4	32.7
Other	27.6	25.9
Total other assets	170.6	112.2
Accounts payable and accrued liabilities
Salaries and benefits	79.1	89.3
Incentive compensation	97.2	151.1
Accrued settlement charge		863.8
Customer credits, advanced payments and advanced billings	25.1	28.4
Self-insurance reserves	10.2	11.1
Dividends	4.4	78.5
Professional service fees	53.9	40.4
Interest accrued on debt	51.7	59.2
Accounts payable	25.0	28.4
Income taxes	53.6	16.8
Restructuring Reserve Current	1.4	6.3
Pension and other post retirement employee benefits	7.3	6.1
Other	81.5	64.9
Total accounts payable and accrued liabilities	490.4	1,444.3
Other liabilities
Pension and other post retirement employee benefits	259.4	264.1
Deferred rent-non-current portion	102.8	98.3
Interest accrued on UTPs	39.6	34.1
Legacy and other tax matters	1.2	1.2
Other	23.1	27.5
Total other liabilities	426.1	$ 425.2
FX Options on Acquisition-Related purchase Price [Member] | Other Current Assets [Member]
Other current assets:
Fair value of Bureau van Dijk purchase price hedge	$ 41.2