CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities
Net income	$ 221.7	$ 191.1
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	23.1	23.6
Stock-based compensation expense	20.3	17.2
Deferred income taxes	27.9	13.1
Excess tax benefits from stock-based compensation plans	(38.8)	(16.1)
Changes in assets and liabilities:
Accounts receivable	(42.8)	(25.0)
Other current assets	(5.0)	12.0
Other assets	(1.8)	(2.0)
Accounts payable and accrued liabilities	131.8	139.6
Restructuring	0	0
Deferred revenue	114.0	97.1
Unrecognized tax benefits	5.5	(10.7)
Other liabilities	4.1	(20.5)
Net cash provided by operating activities	177.2	202.6
Cash flows from investing activities
Capital additions	(19.1)	(8.6)
Purchases of short-term investments	(4.3)	(5.6)
Sales and maturities of short-term investments	13.8	11.4
Net cash used in investing activities	(82.2)	(2.8)
Cash paid into escrow for ICRA share tender offer	(72.6)	0
Cash flows from financing activities
Repayments of notes	0	(31.9)
Net proceeds from stock-based compensation plans	6.0	1.7
Cost of treasury shares repurchased	(201.6)	(91.3)
Excess tax benefits from stock-based compensation plans	38.8	16.1
Payment of dividends	(59.9)	(44.5)
Payment of dividends to noncontrolling interests	(5.4)	(6.1)
Contingent consideration paid	0	0
Debt issuance costs and related fees	0	0
Net cash used in financing activities	(222.1)	(156.0)
Effect of exchange rate changes on cash and cash equivalents	(0.2)	(41.2)
Net increase in cash and cash equivalents	(127.3)	2.6
Cash and cash equivalents, beginning of the period	1,919.5	1,755.4
Cash and cash equivalents, end of the period	$ 1,792.2	$ 1,758.0