Realized and Unrealized Gains and Loss (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2026	Mar. 30, 2025
Realized gains and losses included in 'Other (income) expense, net' in the condensed consolidated statement of operations
Realized gains	$ 0.7	$ 0.7
Realized losses	0.1	1.2
Unrealized gains and losses on equity securities included in 'Other (income) expense, net' in the condensed consolidated statement of operations
Unrealized gains on equity securities	0.0	0.2
Unrealized losses on equity securities	$ 4.0	$ 3.1