Net Income (Loss) Per Common Share - Reconciliation of Numerator and Denominators of Basic and Diluted Net Income (Loss) Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Numerator (in millions):
Net income (loss) attributable to Cott Corporation Continuing operations	$ 4.6	$ (10.2)
Net (loss) income attributable to Cott Corporation - Discontinued operations	356.8	(26.2)
Net income (loss) attributable to Cott Corporation	$ 361.4	$ (36.4)
Weighted average common shares outstanding - basic	139,953	138,735
Continuing operations	$ 0.03	$ (0.07)
Discontinued operations	2.55	(0.19)
Net income (loss)	$ 2.58	$ (0.26)
Denominator (in thousands):
Weighted average common shares outstanding - basic	139,953	138,735
Weighted average common shares outstanding - diluted	142,335	138,735
Diluted Earnings Per Share:
Continued operations	$ 0.03	$ (0.07)
Discontinued operations	2.51	(0.19)
Net income (loss)	$ 2.54	$ (0.26)
Performance-Based RSUs [Member]
Denominator (in thousands):
Dilutive effect of awards	821
Time-Based RSUs [Member]
Denominator (in thousands):
Dilutive effect of awards	222
Stock Options [Member]
Denominator (in thousands):
Dilutive effect of awards	1,339