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Fair Value Measurements and Financial Risk - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Assets
Total assets at fair value	$ 156.4	$ 194.8
Liabilities
Market-based share awards liability	0.5	0.5
Contingent consideration	29.1	10.7
Total liabilities at fair value	29.6	11.2
Cash and Cash Equivalents [Member]
Assets
Cash and cash equivalents	86.0	31.1
Money Market Mutual Funds [Member]
Assets
Cash and cash equivalents	70.4	163.7
Fair Value Measurements Recurring [Member] | Level 1 [Member]
Assets
Total assets at fair value	156.4	194.8
Fair Value Measurements Recurring [Member] | Level 3 [Member]
Liabilities
Market-based share awards liability	0.5	0.5
Contingent consideration	29.1	10.7
Total liabilities at fair value	29.6	11.2
Fair Value Measurements Recurring [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	86.0	31.1
Fair Value Measurements Recurring [Member] | Money Market Mutual Funds [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	$ 70.4	$ 163.7

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Amount of liability recognized arising from contingent consideration in a business combination.

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