Income Taxes - Components of Deferred Taxes (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Inventory	$ 202.6	$ 204.0
Net operating loss carryover	452.4	484.3
Tax credit carryover	100.5	81.8
Capital loss carryover	7.4	8.1
Product liability and litigation	25.9	27.9
Accrued liabilities	54.8	92.4
Share-based compensation	42.2	44.4
Accounts receivable	31.2	23.0
Research and development	129.9	103.9
Lease liability	58.1	52.6
Other	9.4	25.2
Total deferred tax assets	1,114.4	1,147.6
Less: Valuation allowances	(449.4)	(464.6)
Total deferred tax assets after valuation allowances	665.0	683.0
Deferred tax liabilities:
Fixed assets	118.2	122.2
Intangible assets	437.0	466.5
Foreign currency items	40.8
Lease asset	51.4	48.8
Other	50.0	41.2
Total deferred tax liabilities	697.4	678.7
Total net deferred income taxes		$ 4.3
Total net deferred income taxes	$ (32.4)