Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Millions		3 Months Ended
	Dec. 01, 2021	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill		$ 7,803.4	$ 7,904.9
Restricted cash		15.5	$ 156.7	$ 16.9	$ 14.7
ProQuest
Business Acquisition [Line Items]
Accounts receivable	$ 113.5	114.7
Prepaid expenses	22.3	23.2
Other current assets	23.7	23.7
Property and equipment, net	62.3	65.4
Other intangible assets(1)	3,534.7	3,534.7
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets	3.5	3.5
Other non-current assets	18.0	18.0
Operating lease right-of-use assets	28.4	28.4
Total assets	3,806.4	3,811.6
Accounts payable	17.1	17.1
Accrued expenses and other current liabilities	136.8	134.5
Current portion of long-term debt	1.1	1.1
Current portion of deferred revenue	335.2	335.2
Current portion of operating lease liabilities	8.0	8.0
Long-term debt	33.4	33.4
Deferred income taxes	58.6	58.7
Non-current portion of deferred revenue	6.8	6.8
Other non-current liabilities	89.2	90.9
Operating lease liabilities	23.1	23.1
Total liabilities	709.3	708.8
Fair value of acquired identifiable assets and liabilities		5.7
Fair value of acquired identifiable assets and liabilities	3,097.1	3,102.8
Purchase price, net of cash	4,994.3
Goodwill	1,897.2	1,891.5
Cash acquired	(52.5)
Restricted cash	2.0
Valued intangible assets	3,528.0
Intangible assets under construction	$ 6.7
ProQuest | Accrued Liabilities
Business Acquisition [Line Items]
Financial liabilities		(2.3)
ProQuest | Deferred Income Tax Charge
Business Acquisition [Line Items]
Financial liabilities		0.1
ProQuest | Other non-current liabilities
Business Acquisition [Line Items]
Financial liabilities		1.7
ProQuest | Liabilities, Total
Business Acquisition [Line Items]
Financial liabilities		(0.5)
ProQuest | Accounts Receivable
Business Acquisition [Line Items]
Financial assets		1.2
ProQuest | Prepaid Expenses and Other Current Assets
Business Acquisition [Line Items]
Financial assets		0.9
ProQuest | Property, Plant and Equipment
Business Acquisition [Line Items]
Financial assets		3.1
ProQuest | Assets, Total
Business Acquisition [Line Items]
Financial assets		$ 5.2