Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jul. 03, 2020	Jul. 02, 2021	Jul. 03, 2020
Income Statement [Abstract]
Sales	$ 740.1	$ 362.0	$ 1,449.3	$ 909.2
Cost of sales	328.2	211.5	640.1	480.3
Gross profit	411.9	150.5	809.2	428.9
Operating expenses:
Selling, general and administrative	283.1	241.9	542.0	510.6
Research and development	30.3	16.5	60.4	51.2
Operating profit (loss)	98.5	(107.9)	206.8	(132.9)
Nonoperating income (expense):
Other income	0.3	0.1	0.6	0.2
Interest expense, net	(13.6)	(14.5)	(31.6)	(17.8)
Income (loss) before income taxes	85.2	(122.3)	175.8	(150.5)
Income tax (benefit) expense	(4.9)	(28.8)	14.0	(39.8)
Net income (loss)	$ 90.1	$ (93.5)	$ 161.8	$ (110.7)
Earnings (loss) per share:
Basic (in USD per share)	$ 0.56	$ (0.59)	$ 1.01	$ (0.69)
Diluted (in USD per share)	$ 0.51	$ (0.59)	$ 0.91	$ (0.69)
Average common stock and common equivalent shares outstanding:
Basic (in shares)	161.2	159.5	160.8	159.3
Diluted (in shares)	178.4	159.5	177.2	159.3