Earnings (Loss) Per Share - Components of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Oct. 01, 2021	Oct. 02, 2020		Oct. 01, 2021		Oct. 02, 2020
Numerator:
Income (loss) from continuing operations	$ 80.2	$ 23.6		$ 221.0		$ (48.6)
Income (loss) from discontinued operations, net of tax (refer to Note 3)	12.7	12.0		33.7		(26.5)
Net income (loss)	$ 92.9	$ 35.6		$ 254.7		$ (75.1)
Denominator:
Weighted-average common shares outstanding used in basic earnings per share (in shares)	161.5	159.7		161.1		159.4
Assumed exercise of dilutive options and vesting of dilutive restricted stock units (in shares)	4.3	2.0		4.4		0.0
Assumed conversion of the Notes (in shares)	12.3	2.2		12.0		0.0
Weighted average common shares outstanding used in diluted earnings (loss) per share (in shares)	178.1	163.9		177.5		159.4
Earnings (loss) per share:
Earnings (loss) from continuing operations - basic (in USD per share)	$ 0.50	$ 0.15		$ 1.37		$ (0.30)
Earnings (loss) from continuing operations - diluted (in USD per share)	0.45	0.14		1.25		(0.30)
Earnings (loss) from discontinued operations - basic (in USD per share)	0.08	0.08		0.21		(0.17)
Earnings (loss) from discontinued operations - diluted (in USD per share)	0.07	0.07		0.19		(0.17)
Earnings (loss) - basic (in USD per share)	0.58	0.22	[1]	1.58		(0.47)
Earnings (loss) - diluted (in USD per share)	$ 0.52	$ 0.22	[1]	$ 1.43	[1]	$ (0.47)

[1] * Earnings (loss) per share is computed independently for earnings (loss) per share from continuing operations and earnings (loss) per share from discontinued operations. The sum of earnings (loss) per share from continuing operations and earnings (loss) per share from discontinued operations does not equal earnings (loss) per share due to rounding.