Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities:
Net income	$ 201.1	$ 83.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	104.6	80.9
Amortization of debt issuance cost and debt discount	1.3	1.0
Change in fair value of contingent consideration	2.2	0.7
Realized gain on financial investments	(0.7)	(0.2)
Provision for deferred income taxes	(13.3)	(15.0)
Stock-based compensation expense	21.0	30.1
Loss on disposition of property	0.5
Impairment of data processing software		14.9
Equity in investments	(1.2)	(0.1)
Excess tax benefit from stock-based compensation		5.7
Changes in assets and liabilities:
Accounts receivable	(35.0)	(33.9)
Income taxes receivable	(29.7)	48.3
Other current assets	(7.4)	(8.4)
Accounts payable and accrued liabilities	18.8	9.1
Section 31 fees payable	84.3	2.9
Deferred revenue	2.0	6.7
Income taxes payable	(3.6)	(50.1)
Income tax liability	2.3	(3.9)
Other liabilities	2.1	0.2
Net Cash Flows used in Operating Activities	349.3	172.1
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired		(1,405.4)
Purchases of financial investments	(130.7)	(89.2)
Proceeds from maturities of financial investments	46.9	45.0
Other	(1.0)	1.4
Purchases of property and equipment	(12.6)	(19.2)
Net Cash Flows (used in) provided by Investing Activities	(97.4)	(1,467.4)
Cash Flows from Financing Activities:
Proceeds from long-term debt	300.0	1,944.2
Principal payments of long term debt	(325.0)	(525.0)
Proceeds from credit facility	15.0
Payments of credit facility	(15.0)
Debt issuance costs	(0.1)	(1.3)
Dividends paid	(61.0)	(56.7)
Purchase of unrestricted stock from employees	(15.8)	(16.0)
Proceeds from exercise of stock-based compensation	0.5	1.3
Payment of contingent consideration from acquisition	(56.6)
Purchase of common stock under announced program	(91.8)
Net Cash Flows provided by (used in) Financing Activities	(249.8)	1,346.5
Effect of Foreign Currency Exchange Rate Changes on Cash and Cash equivalents	(5.6)	0.1
Decrease in Cash and Cash Equivalents	(3.5)	51.3
Beginning of Period	143.5	97.3
End of Period	140.0	148.6
Supplemental disclosure of cash transactions:
Cash paid for income taxes	122.2
Interest paid	$ 18.9
Supplemental disclosure of noncash transactions:
Forfeiture of common stock for payment of exercise of stock options		1.7
Supplemental disclosure of noncash investing activities:
Accounts receivable acquired		117.8
Financial investments acquired		66.0
Property and equipment acquired		21.8
Goodwill acquired		2,649.3
Intangible assets acquired		2,000.0
Other assets acquired		32.8
Accounts payable and accrued expenses assumed		(60.1)
Section 31 fees payable acquired		(143.6)
Deferred tax liability acquired		(718.5)
Other liabilities assumed		(135.4)
Issuance of common stock related to acquisition		$ (2,424.7)