Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 24, 2021	Sep. 25, 2020	Sep. 24, 2021	Sep. 25, 2020
Net loss	$ (263.7)	$ 191.6	$ (513.4)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		0.4	(0.9)	$ (0.5)
Net (loss) income	(263.7)	191.6	(513.4)
Other comprehensive (loss) income, net of tax:
Currency translation adjustments	(1.1)	1.0	(0.3)	0.7
Derivatives, net of tax	0.0	0.0	0.0	0.1
Benefit plans, net of tax	(0.2)	(0.6)	(0.6)	(1.3)
Total other comprehensive (loss) income, net of tax		0.4	(0.9)	(0.5)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total	(265.0)	192.0	(514.3)	(792.2)
Retained Earnings (Deficit)
Net loss	(263.7)	191.6	(513.4)	(791.7)
Net (loss) income	(263.7)	$ 191.6	$ (513.4)	$ (791.7)
Accumulated Other Comprehensive Loss
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(1.3)
Other comprehensive (loss) income, net of tax:
Total other comprehensive (loss) income, net of tax	$ (1.3)