Discontinued Operations - Major Components of Net Income from Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 29, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income from discontinued operations, net of income taxes	$ 1.5		$ 43.0	$ 357.5	$ 1.0
Less: Net income attributable to non-controlling interests	0.0		2.1	0.6	6.4
Net (loss) income attributable to Cott Corporation – discontinued operations	1.5		40.9	356.9	(5.4)
Income tax expense	1.0		0.9	4.0	1.0
Interest expense			8.4	3.4	38.5
Discontinued Operations, Disposed of by Sale | Traditional CSD and Juice Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue, net	0.0		425.6	111.2	1,244.7
Cost of sales	0.0		371.3	98.4	1,093.4
Operating income from discontinued operations	0.0		13.9	2.0	33.6
Gain on sale of discontinued operations	0.6		0.0	427.6	0.0
Income (loss) from discontinued operations, before income taxes	0.6		12.1	402.2	(27.5)
Income tax (benefit) expense	(0.9)		(30.9)	44.7	(28.5)
Net income from discontinued operations, net of income taxes	1.5		43.0	357.5	1.0
Less: Net income attributable to non-controlling interests	0.0		2.1	0.6	6.4
Net (loss) income attributable to Cott Corporation – discontinued operations	$ 1.5		$ 40.9	$ 356.9	$ (5.4)
Discontinued Operations, Disposed of by Sale | Traditional CSD and Juice Business | Valuation Allowance of Deferred Tax Assets | U.S. Federal
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense		$ (25.0)