Other Balance Sheet and Statement of Operations Information - Additional Details Related to Certain Balance Sheet Captions (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Other current assets:
Prepaid taxes	$ 103.8	$ 100.1
Prepaid expenses	104.4	102.0
Capitalized costs to obtain and fulfill sales contracts	76.4	77.2
Other	2.0	3.0
Total other current assets	286.6	282.3
Other assets
Investments in joint ventures	111.6	104.6
Deposits for real-estate leases	13.7	13.5
Indemnification assets related to acquisitions	16.2	16.1
Mutual funds and fixed deposits	22.3	18.9
Costs to obtain sales contracts	86.1	78.0
Other	71.3	43.2
Total other assets	321.2	274.3
Accounts payable and accrued liabilities
Salaries and benefits	132.3	112.5
Incentive compensation	51.0	154.5
Customer credits, advanced payments and advanced billings	22.9	20.4
Self-insurance reserves	9.3	10.6
Dividends	4.0	6.5
Professional service fees	58.1	47.7
Interest accrued on debt	36.4	70.5
Accounts payable	19.5	30.1
Income taxes	65.4	71.4
Pension and other post retirement employee benefits	6.4	6.4
Foreign exchange forwards on certain assets and liabilities	10.9	8.2
Restructuring liability	25.6	35.5
Accrued royalties	14.0	25.1
Other	81.3	95.8
Total accounts payable and accrued liabilities	537.1	695.2
Other liabilities
Pension and other post retirement employee benefits	256.5	249.2
Deferred rent-non-current portion		94.3
Interest accrued on UTPs	74.9	69.6
Other tax matters	1.3	1.3
Income tax liability - non-current	125.3	125.3
Interest rate swaps	2.3	5.3
Restructuring liability	3.2	6.8
Other	23.1	24.7
Total other liabilities	$ 486.6	$ 576.5