Revision of Previously Reported Financial Information - Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts payable and accrued liabilities	$ 463.4	$ 431.8	$ 450.1	$ 412.9
Total current liabilities	475.5	440.5	455.9	933.4
Total liabilities	1,946.0	1,906.6	1,958.3	3,207.4
Accumulated other comprehensive loss	(91.1)	(90.5)	(73.0)	(94.4)
Total Cott Corporation Equity	$ 1,214.1	1,228.6	1,253.5	$ 879.6
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts payable and accrued liabilities		421.5	439.8
Total current liabilities		430.2	445.6
Total liabilities		1,896.3	1,948.0
Accumulated other comprehensive loss		(80.2)	(62.7)
Total Cott Corporation Equity		1,238.9	1,263.8
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts payable and accrued liabilities		10.3	10.3
Total current liabilities		10.3	10.3
Total liabilities		10.3	10.3
Accumulated other comprehensive loss		(10.3)	(10.3)
Total Cott Corporation Equity		$ (10.3)	$ (10.3)