Condensed Consolidated Statements of Cash Flows $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Cash Flows from Operating Activities:
Net income	$ 271.0	$ 178.6
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	78.5	90.9
Amortization of debt issuance cost and debt discount	1.0	1.2
Change in fair value of contingent consideration		1.6
Realized gain on available-for-sale securities	(0.4)	(0.7)
Provision for credit losses	0.4	0.6
Provision for deferred income taxes	(11.0)	(11.0)
Stock-based compensation expense	12.9	11.7
Impairment of assets held for sale	8.1	6.1
Impairment of goodwill		10.5
Equity in investments	(0.7)	(4.5)
Changes in assets and liabilities:
Accounts receivable	(144.2)	41.5
Income taxes receivable	56.8
Other current assets	(1.8)	(5.2)
Other assets	(12.1)
Accounts payable and accrued liabilities	45.3	(51.9)
Section 31 fees payable	148.5	38.1
Deferred revenue	11.6	4.6
Income taxes payable	11.1	(2.5)
Unrecognized tax benefits	12.9	12.5
Other liabilities	0.4	(4.5)
Net cash provided by operating activities	488.3	317.6
Cash flows from investing activities:
Acquisitions, net of cash acquired	(66.6)
Purchases of available-for-sale financial investments	(154.9)	(61.8)
Proceeds from maturities of available-for-sale financial investments	47.3	35.5
Return of capital from investments	4.5	22.0
Contributions to investments	(4.7)
Purchases of property and equipment	(17.2)	(19.1)
Net cash used in investing activities	(191.6)	(23.4)
Cash flows from financing activities:
Principal payments of long term debt		(300.0)
Cash dividends paid on common stock	(79.5)	(69.6)
Repurchases of common stock from employee stock plans	(14.1)	(10.4)
Exercise of common stock options	0.2	8.5
Payment of contingent consideration from acquisition	(2.2)
Purchase of common stock	(219.3)	(35.0)
Net cash used in financing activities	(314.9)	(406.5)
Effect of foreign currency exchange rates on cash and cash equivalents	(1.0)	(1.5)
Decrease in cash and cash equivalents	(19.2)	(113.8)
Cash and cash Equivalents: Beginning of Period	229.3	275.1
Cash and cash Equivalents: End of Period	210.1	161.3
Supplemental disclosure of cash transactions:
Cash paid for income taxes	33.3	67.3
Cash paid for interest	14.4	$ 16.7
Supplemental disclosure of noncash investing activities:
Accounts receivable acquired	0.7
Other current assets acquired	0.4
Goodwill acquired	66.4
Intangible assets acquired	22.3
Accounts payable and accrued expenses assumed	(1.4)
Deferred revenue acquired	(1.3)
Contingent consideration related to acquisitions	$ (20.5)