Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions		3 Months Ended			6 Months Ended		9 Months Ended		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020		Jun. 30, 2020		Sep. 30, 2020		Dec. 31, 2020
Cash flows provided by (used in) operating activities:
Net income (loss)		$ (23.3)	$ 74.3	[1]
Reconciliation of net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization		149.7	134.4	[1]
Amortization of unrecognized pension loss (gain)		0.5	(0.1)	[1]
Equity-based compensation expense		7.9	3.8	[1]
Restructuring charge		5.8	4.8	[1]
Restructuring payments		(3.3)	(6.0)	[1]
Change in fair value of make-whole derivative liability		0.0	(69.8)
Changes in deferred income taxes		(26.1)	(12.0)	[1]
Changes in prepaid and accrued income taxes		11.0	(71.0)	[1]
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	[2]	9.9	17.4	[1]
(Increase) decrease in other current assets	[2]	60.2	(4.4)	[1]
Increase (decrease) in deferred revenue	[2]	78.7	85.3	[1]
Increase (decrease) in accounts payable	[2]	(2.1)	(2.1)	[1]
Increase (decrease) in accrued liabilities	[2]	(61.5)	(99.0)	[1]
Increase (decrease) in other accrued and current liabilities	[2]	(20.9)	(28.6)	[1]
(Increase) decrease in other long-term assets	[2]	(2.6)	(8.2)	[1]
Increase (decrease) in long-term liabilities	[2]	(23.9)	(15.7)	[1]
Net, other non-cash adjustments	[3]	8.2	2.0	[1]
Net cash provided by (used in) operating activities		168.2	5.1	[1]	$ 127.7		$ 130.7		$ 205.0
Cash flows provided by (used in) investing activities:
Acquisitions of businesses, net of cash acquired		(617.0)	(15.8)	[1]
Cash settlements of foreign currency contracts		23.3	1.6	[1]
Capital expenditures		(1.2)	(1.4)	[1]
Additions to computer software and other intangibles		(42.4)	(18.4)	[1]
Other investing activities, net		(0.6)	0.0	[1]
Net cash provided by (used in) investing activities		(637.9)	(34.0)	[1]	(68.5)		(112.3)		(133.3)
Cash flows provided by (used in) financing activities:
Payments of dividends		0.0	(32.0)	[1]
Payment of debt issuance costs		(2.6)	(0.8)	[1]
Other financing activities, net		(0.3)	(0.3)	[1]
Net cash provided by (used in) financing activities		290.1	103.9	[1]	(48.7)		196.2		188.6
Effect of exchange rate changes on cash and cash equivalents		0.7	(1.3)	[1]
Increase (decrease) in cash and cash equivalents		(178.9)	73.7	[1]
Cash and Cash Equivalents, Beginning of Period		352.3	84.4	[1]	$ 84.4	[1]	$ 84.4	[1]	84.4	[1]
Cash and Cash Equivalents, End of Period		173.4	158.1	[1]					$ 352.3
Cash Paid for:
Income Taxes, Net of Refunds		(57.4)	8.8	[1]
Interest		63.0	103.1	[1]
Credit Facility
Cash flows provided by (used in) financing activities:
Proceeds from borrowings on lines of credit		50.0	337.1	[1]
Payments of borrowings on lines of credit		(50.0)	(137.1)	[1]
Term Loan Facility
Cash flows provided by (used in) financing activities:
Proceeds from borrowings on lines of credit		300.0	0.0	[1]
Payments of borrowings on lines of credit		(7.0)	0.0	[1]
Bridge Loan
Cash flows provided by (used in) financing activities:
Payments of borrowings on lines of credit		$ 0.0	$ (63.0)	[1]

[1] See discussion in Note 1 - Basis of Presentation for further detail regarding the elimination of the International lag reporting.

[2] Net of the effect of acquisitions, see further details in Note 14.

[3] Includes non-cash amortization of deferred debt issuance cost and discount of $4.7 million and $11.9 million for the three months ended March 31, 2021 and 2020, respectively.