Common Shares and Net (Loss) Income per Common Share - Reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Numerator (in millions of U.S. dollars):
Net (loss) income from continuing operations	$ (8.3)	$ (131.7)	$ (18.5)	$ (159.1)
Net (loss) income from discontinued operations	0.0	(4.3)	0.0	26.6
Net loss	$ (8.3)	$ (136.0)	$ (18.5)	$ (132.5)
Denominator (in thousands):
Weighted average common shares outstanding - basic (in shares)	161,561	159,931	161,097	150,535
Basic Earnings Per Share:
Continuing operations (in USD per share)	$ (0.05)	$ (0.82)	$ (0.11)	$ (1.06)
Discontinued operations (in USD per share)	0	(0.03)	0	0.18
Net loss (in USD per share)	$ (0.05)	$ (0.85)	$ (0.11)	$ (0.88)
Denominator (in thousands):
Weighted average common shares outstanding - basic (in shares)	161,561	159,931	161,097	150,535
Weighted average common shares outstanding - diluted (in shares)	161,561	159,931	161,097	150,535
Continued operations (in USD per share)	$ (0.05)	$ (0.82)	$ (0.11)	$ (1.06)
Discontinued operations (in USD per share)	0	(0.03)	0	0.18
Net loss (in USD per share)	$ (0.05)	$ (0.85)	$ (0.11)	$ (0.88)
Performance-based RSUs
Denominator (in thousands):
Dilutive effect (in shares)	0	0	0	0
Time-based RSUs
Denominator (in thousands):
Dilutive effect (in shares)	0	0	0	0
Stock Options
Denominator (in thousands):
Dilutive effect (in shares)	0	0	0	0