Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021	Dec. 28, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax expense (benefit) based on Canadian statutory rates	$ 1.6	$ (40.4)	$ (1.7)
Foreign tax rate differential	(7.1)	(4.3)	(10.0)
Local taxes	2.2	2.1	1.1
Nontaxable interest income	(9.3)	(8.7)	(8.4)
Impairment expense	0.0	17.6	0.0
Impact of intercompany transactions and dividends	5.9	10.8	12.2
Income tax credits	(0.3)	(0.5)	(0.7)
Change in enacted tax rates	(0.2)	(1.7)	(0.1)
Change in valuation allowance	9.6	28.5	19.7
Change in uncertain tax positions	0.9	(1.5)	0.1
Equity compensation	2.2	1.9	1.3
Permanent differences	0.9	1.6	1.3
Effective Income Tax Rate Reconciliation, Prior Year Income Tax Adjustment, Percent	3.1	(1.1)	(10.4)
Other items	0.0	0.0	0.1
Income tax expense	$ 9.5	$ 4.3	$ 4.5