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Business Combinations - Pro Forma Information (Details) - ProQuest - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2021
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Pro forma revenues, net | $ 663.4 | $ 1,992.6
Pro forma net loss attributable to the Company's shareholders | $ 56.3 | $ (159.5)

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