CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities
Net income	$ 444.7	$ 495.4
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	61.1	56.5
Stock-based compensation expense	48.9	44.4
Deferred income taxes	13.7	10.6
Excess tax benefits from stock-based compensation plans	(17.6)	(41.1)
Changes in assets and liabilities:
Accounts receivable	(45.2)	(11.8)
Other current assets	19.2	(3.3)
Other assets	13.7	(3.5)
Accounts payable and accrued liabilities	(69.8)	(35.0)
Deferred revenue	66.7	63.0
Unrecognized tax benefits and other non-current tax liabilities	(4.3)	(12.1)
Other liabilities	(2.3)	31.3
Net cash provided by operating activities	528.8	594.4
Cash flows from investing activities
Capital additions	(54.3)	(40.7)
Purchases of investments	(174.5)	(289.2)
Sales and maturities of investments	294.9	221.9
Acquisitions, net of cash required	(75.9)	(4.6)
Settlement of net investment hedges	2.5	20.8
Net cash used in investing activities	(7.3)	(91.8)
Cash flows from financing activities
Issuance of notes		552.8
Proceeds from stock-based compensation plans	36.9	55.0
Repurchase of shares for payroll tax withholdings related to stock-based compensation	(43.2)	(59.1)
Cost of treasury shares repurchased	(485.9)	(600.7)
Excess tax benefits from settlement of stock-based compensation plans	17.6	41.1
Payment of dividends	(143.6)	(137.2)
Payment of dividends to noncontrolling interests	(4.6)	(3.7)
Debt issuance costs and related fees		(5.8)
Net cash (used in) provided by financing activities	(622.8)	(157.6)
Effect of exchange rate changes on cash and cash equivalents	18.2	(25.9)
Net increase (decrease) in cash and cash equivalents	(83.1)	319.1
Cash and cash equivalents, beginning of the period	1,757.4	1,219.5
Cash and cash equivalents, end of the period	$ 1,674.3	$ 1,538.6