Common Shares and Net Income (Loss) per Common Share - Reconciliation (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Numerator:
Net income (loss) attributable to Cott Corporation - Continuing operations	$ 8.6	$ 8.5	$ (6.7)	$ 25.3
Net (loss) income attributable to Cott Corporation – Discontinued operations	1.5	1.5	1.5	356.9
Net income (loss) attributable to Cott Corporation	$ 10.1	$ 10.0	$ (5.2)	$ 382.2
Denominator:
Weighted average common shares outstanding - basic (in shares)	134,667	138,787	135,395	139,503
Basic Earnings Per Share:
Continuing operations (usd per share)	$ 0.06	$ 0.06	$ (0.05)	$ 0.18
Discontinued operations (usd per share)	0.01	0.01	0.01	2.56
Net income (loss) (usd per share)	$ 0.07	$ 0.07	$ (0.04)	$ 2.74
Denominator:
Weighted average common shares outstanding - basic (in shares)	134,667	138,787	135,395	139,503
Weighted average common shares outstanding - diluted (in shares)	136,208	141,176	135,395	141,963
Continued operations (usd per share)	$ 0.06	$ 0.06	$ (0.05)	$ 0.18
Discontinued operations (usd per share)	0.01	0.01	0.01	2.51
Net income (loss) (usd per share)	$ 0.07	$ 0.07	$ (0.04)	$ 2.69
Performance-based RSUs
Denominator:
Dilutive effect (in shares)	644	918	0	954
Time-based RSUs
Denominator:
Dilutive effect (in shares)	211	259	0	246
Stock Options
Denominator:
Dilutive effect (in shares)	686	1,212	0	1,260