Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Apr. 02, 2021	Apr. 03, 2020
Income Statement [Abstract]
Sales	$ 709.2	$ 547.2
Cost of sales	311.9	268.8
Gross profit	397.3	278.4
Operating expenses:
Selling, general and administrative	258.9	268.7
Research and development	30.1	34.7
Operating profit (loss)	108.3	(25.0)
Nonoperating income (expense):
Other income	0.3	0.1
Interest expense, net	(18.0)	(3.3)
Income (loss) before income taxes	90.6	(28.2)
Income tax expense (benefit)	18.9	(11.0)
Net income (loss)	$ 71.7	$ (17.2)
Earnings (loss) per share:
Basic (in USD per share)	$ 0.45	$ (0.11)
Diluted (in USD per share)	$ 0.41	$ (0.11)
Average common stock and common equivalent shares outstanding:
Basic (in shares)	160.5	159.2
Diluted (in shares)	175.9	159.2