CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities
Net income	$ 186.6	$ 231.3
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	29.9	28.6
Stock-based compensation expense	25.4	22.7
Deferred income taxes	11.3	7.6
Excess tax benefits from stock-based compensation plans	(16.3)	(37.4)
Changes in assets and liabilities:
Accounts receivable	(45.5)	(62.7)
Other current assets	13.6	2.9
Other assets	1.5	(13.9)
Accounts payable and accrued liabilities	(99.0)	(72.8)
Deferred revenue	122.6	127.9
Unrecognized tax benefits and other non-current tax liabilities	5.3	7.4
Other liabilities	1.9	20.2
Net cash provided by operating activities	237.3	261.8
Cash flows from investing activities
Capital additions	(26.3)	(19.0)
Purchases of short-term investments	(134.6)	(167.9)
Sales and maturities of short-term investments	126.1	116.8
Acquisitions, net of cash required	(75.9)
Settlement of net investment hedges	2.3	20.8
Net cash used in investing activities	(108.4)	(49.3)
Cash flows from financing activities
Issuance of notes		552.8
Proceeds from stock-based compensation plans	24.3	34.8
Repurchase of shares for payroll tax withholdings related to stock-based compensation	(42.7)	(58.7)
Cost of treasury shares repurchased	(262.1)	(365.8)
Excess tax benefits from settlement of stock-based compensation plans	16.3	37.4
Payment of dividends	(72.1)	(68.7)
Payment of dividends to noncontrolling interests	(2.9)	(3.7)
Debt issuance costs and related fees		(4.2)
Net cash (used in) provided by financing activities	(339.2)	123.9
Effect of exchange rate changes on cash and cash equivalents	29.0	(46.0)
Net increase (decrease) in cash and cash equivalents	(181.3)	290.4
Cash and cash equivalents, beginning of the period	1,757.4	1,219.5
Cash and cash equivalents, end of the period	$ 1,576.1	$ 1,509.9