Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Income Statement [Abstract]
Revenue, net	$ 456.8	$ 455.6	$ 931.0	$ 883.3
Cost of sales	202.1	184.0	403.0	368.6
Gross profit	254.7	271.6	528.0	514.7
Selling, general and administrative expenses	246.7	245.7	501.8	481.5
Loss on disposal of property, plant and equipment, net	2.5	1.7	3.9	3.6
Acquisition and integration expenses	4.3	2.7	25.1	7.4
Goodwill and intangible asset impairment charges	115.2	0.0	115.2	0.0
Operating (loss) income	(114.0)	21.5	(118.0)	22.2
Other (income) expense, net	(1.6)	(2.2)	5.4	3.3
Interest expense, net	20.7	18.8	40.4	38.1
(Loss) income from continuing operations before income taxes	(133.1)	4.9	(163.8)	(19.2)
Income tax (benefit) expense	(1.4)	2.2	(4.7)	0.8
Net (loss) income from continuing operations	(131.7)	2.7	(159.1)	(20.0)
Net (loss) income from discontinued operations, net of income taxes	(4.3)	1.7	26.6	4.7
Net (loss) income	$ (136.0)	$ 4.4	$ (132.5)	$ (15.3)
Basic:
Continuing operations (in USD per share)	$ (0.82)	$ 0.02	$ (1.06)	$ (0.15)
Discontinued operations (in USD per share)	(0.03)	0.01	0.18	0.04
Net (loss) income (in USD per share)	(0.85)	0.03	(0.88)	(0.11)
Diluted:
Continuing operations (in USD per share)	(0.82)	0.02	(1.06)	(0.15)
Discontinued operations (in USD per share)	(0.03)	0.01	0.18	0.04
Net (loss) income (in USD per share)	$ (0.85)	$ 0.03	$ (0.88)	$ (0.11)
Weighted average common shares outstanding (in thousands)
Basic (in shares)	159,931	135,569	150,535	135,758
Diluted (in shares)	159,931	137,306	150,535	135,758