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Note 10 - Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018	Sep. 09, 2020
Goodwill, Ending Balance		$ 4,108.1		$ 3,864.3	$ 3,361.5
Cash acquired		(11.1)		(10.4)	(3.1)
Net cash purchase price		275.8		699.2	138.2
Franco Signor [Member]
Cash and cash equivalents	[1]	10.9
Accounts receivable		2.5
Other current assets		0.4
Fixed assets		0.4
Operating lease right-of-use assets, net		1.5
Intangible assets		59.1
Goodwill, Ending Balance		100.3
Other assets		8.0
Total assets acquired		183.1
Current liabilities	[1]	(6.4)
Deferred revenues		(0.3)
Operating lease liabilities		(1.5)
Deferred income tax, net		(1.8)
Other liabilities		(8.0)
Total liabilities assumed		(18.0)
Net assets acquired		165.1
Cash and cash equivalents	[1]	(10.9)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash		5.7	[1]			$ 5.7
Cash acquired		(5.2)
Net cash purchase price		159.9
Current liabilities	[1]	6.4
Deferred revenues		0.3
Operating lease liabilities		1.5
Deferred income tax, net		1.8
Other liabilities		8.0
Total liabilities assumed		18.0
Lead Intelligence [Member]
Cash and cash equivalents	[1]	5.9
Accounts receivable		2.9
Other current assets		0.6
Fixed assets		0.7
Operating lease right-of-use assets, net		1.7
Intangible assets		64.4
Goodwill, Ending Balance		71.4
Other assets		1.3
Total assets acquired		148.9
Current liabilities	[1]	(1.3)
Deferred revenues		(2.3)
Operating lease liabilities		(1.7)
Deferred income tax, net		(11.2)
Other liabilities		(1.3)
Total liabilities assumed		(17.8)
Net assets acquired		131.1
Cash and cash equivalents	[1]	(5.9)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash	[1]	0.0
Cash acquired		(5.9)
Net cash purchase price		125.2
Current liabilities	[1]	1.3
Deferred revenues		2.3
Operating lease liabilities		1.7
Deferred income tax, net		11.2
Other liabilities		1.3
Total liabilities assumed		17.8
2020 Acquisitions [Member]
Cash and cash equivalents	[1]	16.8
Accounts receivable		5.4
Other current assets		1.0
Fixed assets		1.1
Operating lease right-of-use assets, net		3.2
Intangible assets		123.5
Goodwill, Ending Balance		171.7
Other assets		9.3
Total assets acquired		332.0
Current liabilities	[1]	(7.7)
Deferred revenues		(2.6)
Operating lease liabilities		(3.2)
Deferred income tax, net		(13.0)
Other liabilities		(9.3)
Total liabilities assumed		(35.8)
Net assets acquired		296.2
Cash and cash equivalents	[1]	(16.8)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash	[1]	5.7
Cash acquired		(11.1)
Net cash purchase price		285.1
Current liabilities	[1]	7.7
Deferred revenues		2.6
Operating lease liabilities		3.2
Deferred income tax, net		13.0
Other liabilities		9.3
Total liabilities assumed		$ 35.8
Flexible Architecture and Simplified Technology LLC [Member]
Cash and cash equivalents				2.9
Accounts receivable				4.7
Other current assets				0.4
Fixed assets				1.8
Operating lease right-of-use assets, net				1.4
Intangible assets				69.0
Goodwill, Ending Balance				120.7
Other assets				0.1
Total assets acquired				201.0
Current liabilities				(2.4)
Deferred revenues				(0.3)
Operating lease liabilities				(1.4)
Deferred income tax, net				0.0
Other liabilities				0.0
Total liabilities assumed				(4.1)
Net assets acquired				196.9
Cash and cash equivalents				(2.9)
Cash acquired				(3.0)
Net cash purchase price				193.9
Current liabilities				2.4
Deferred revenues				0.3
Operating lease liabilities				1.4
Deferred income tax, net				0.0
Other liabilities				0.0
Total liabilities assumed				4.1
Genscape, Inc. [Member]
Cash and cash equivalents				0.2
Accounts receivable				13.6
Other current assets				1.4
Fixed assets				15.9
Operating lease right-of-use assets, net				7.4
Intangible assets				153.2
Goodwill, Ending Balance				241.4
Other assets				0.0
Total assets acquired				433.1
Current liabilities				(17.4)
Deferred revenues				(27.3)
Operating lease liabilities				(7.4)
Deferred income tax, net				(29.8)
Other liabilities				0.0
Total liabilities assumed				(81.9)
Net assets acquired				351.2
Cash and cash equivalents				(0.2)
Cash acquired				(0.2)
Net cash purchase price				351.0
Current liabilities				17.4
Deferred revenues				27.3
Operating lease liabilities				7.4
Deferred income tax, net				29.8
Other liabilities				0.0
Total liabilities assumed				81.9
BuildFax Inc. [Member]
Cash and cash equivalents				0.4
Accounts receivable				1.8
Other current assets				0.1
Fixed assets				0.9
Operating lease right-of-use assets, net				0.4
Intangible assets				21.9
Goodwill, Ending Balance				20.2
Other assets				0.0
Total assets acquired				45.7
Current liabilities				(0.9)
Deferred revenues				(2.4)
Operating lease liabilities				(0.4)
Deferred income tax, net				(0.4)
Other liabilities				(1.0)
Total liabilities assumed				(5.1)
Net assets acquired				40.6
Cash and cash equivalents				(0.4)
Cash acquired				(0.4)
Net cash purchase price				40.2
Current liabilities				0.9
Deferred revenues				2.4
Operating lease liabilities				0.4
Deferred income tax, net				0.4
Other liabilities				1.0
Total liabilities assumed				5.1
CaaS [Member]
Cash and cash equivalents				3.7
Accounts receivable				0.0
Other current assets				0.7
Fixed assets				0.2
Operating lease right-of-use assets, net				0.0
Intangible assets				34.4
Goodwill, Ending Balance				41.2
Other assets				0.1
Total assets acquired				80.3
Current liabilities				(1.3)
Deferred revenues				(10.1)
Operating lease liabilities				0.0
Deferred income tax, net				0.0
Other liabilities				0.0
Total liabilities assumed				(11.4)
Net assets acquired				68.9
Cash and cash equivalents				(3.7)
Cash acquired				(3.7)
Net cash purchase price				65.2
Current liabilities				1.3
Deferred revenues				10.1
Operating lease liabilities				0.0
Deferred income tax, net				0.0
Other liabilities				0.0
Total liabilities assumed				11.4
Acquisition, Others [Member]
Cash and cash equivalents				3.1	2.2
Accounts receivable				3.9	1.0
Other current assets				0.6	0.2
Fixed assets				6.3	0.2
Operating lease right-of-use assets, net				0.5
Intangible assets				14.1	8.4
Goodwill, Ending Balance				28.2	15.8
Other assets				4.4	0.0
Total assets acquired				61.1	27.8
Current liabilities				(1.3)	(1.0)
Deferred revenues				0.0	(1.1)
Operating lease liabilities				(0.5)
Deferred income tax, net				(2.6)	(1.5)
Other liabilities				(5.3)	0.0
Total liabilities assumed				(9.7)	(3.6)
Net assets acquired				51.4	24.2
Cash and cash equivalents				(3.1)	(2.2)
Cash acquired				(3.1)	(2.2)
Net cash purchase price				48.3	22.0
Current liabilities				1.3	1.0
Deferred revenues				0.0	1.1
Operating lease liabilities				0.5
Deferred income tax, net				2.6	1.5
Other liabilities				5.3	0.0
Total liabilities assumed				9.7	3.6
2019 Acquisitions [Member]
Cash and cash equivalents				10.3
Accounts receivable				24.0
Other current assets				3.2
Fixed assets				25.1
Operating lease right-of-use assets, net				9.7
Intangible assets				292.6
Goodwill, Ending Balance				451.7
Other assets				4.6
Total assets acquired				821.2
Current liabilities				(23.3)
Deferred revenues				(40.1)
Operating lease liabilities				(9.7)
Deferred income tax, net				(32.8)
Other liabilities				(6.3)
Total liabilities assumed				(112.2)
Net assets acquired				709.0
Cash and cash equivalents				(10.3)
Cash acquired				(10.4)
Net cash purchase price				698.6
Current liabilities				23.3
Deferred revenues				40.1
Operating lease liabilities				9.7
Deferred income tax, net				32.8
Other liabilities				6.3
Total liabilities assumed				$ 112.2
Rulebook [Member]
Cash and cash equivalents					0.0
Accounts receivable					2.0
Other current assets					0.1
Fixed assets					1.5
Intangible assets					25.1
Goodwill, Ending Balance					58.9
Other assets					8.6
Total assets acquired					96.2
Current liabilities					(0.6)
Deferred revenues					(0.4)
Deferred income tax, net					(0.1)
Other liabilities					(8.6)
Total liabilities assumed					(9.7)
Net assets acquired					86.5
Cash and cash equivalents					0.0
Cash acquired					0.0
Net cash purchase price					86.5
Current liabilities					0.6
Deferred revenues					0.4
Deferred income tax, net					0.1
Other liabilities					8.6
Total liabilities assumed					9.7
Validus-IVC Limited [Member]
Cash and cash equivalents					0.9
Accounts receivable					1.5
Other current assets					6.3
Fixed assets					0.4
Intangible assets					20.9
Goodwill, Ending Balance					24.8
Other assets					0.0
Total assets acquired					54.8
Current liabilities					(3.9)
Deferred revenues					(0.1)
Deferred income tax, net					(3.6)
Other liabilities					(0.2)
Total liabilities assumed					(7.8)
Net assets acquired					47.0
Cash and cash equivalents					(0.9)
Cash acquired					(0.9)
Net cash purchase price					46.1
Current liabilities					3.9
Deferred revenues					0.1
Deferred income tax, net					3.6
Other liabilities					0.2
Total liabilities assumed					7.8
2018 Acquisition [Member]
Cash and cash equivalents					3.1
Accounts receivable					4.5
Other current assets					6.6
Fixed assets					2.1
Intangible assets					54.4
Goodwill, Ending Balance					99.5
Other assets					8.6
Total assets acquired					178.8
Current liabilities					(5.5)
Deferred revenues					(1.6)
Deferred income tax, net					(5.2)
Other liabilities					(8.8)
Total liabilities assumed					(21.1)
Net assets acquired					157.7
Cash and cash equivalents					(3.1)
Cash acquired					(3.1)
Net cash purchase price					154.6
Current liabilities					5.5
Deferred revenues					1.6
Deferred income tax, net					5.2
Other liabilities					8.8
Total liabilities assumed					$ 21.1
[1] Within cash and cash equivalents, there is $5.7 million of restricted cash related to Franco Signor's professional administrative services for Medicare Set Asides, with an offsetting liability of $5.7 million included within current liabilities.

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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