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
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Numerator (in millions of U.S. dollars):
Net (loss) income from continuing operations	$ (131.7)	$ 2.7	$ (159.1)	$ (20.0)
Net (loss) income from discontinued operations, net of income taxes	(4.3)	1.7	26.6	4.7
Net (loss) income	$ (136.0)	$ 4.4	$ (132.5)	$ (15.3)
Denominator (in thousands):
Weighted average common shares outstanding - basic (in shares)	159,931	135,569	150,535	135,758
Basic Earnings Per Share:
Continuing operations (in USD per share)	$ (0.82)	$ 0.02	$ (1.06)	$ (0.15)
Discontinued operations (in USD per share)	(0.03)	0.01	0.18	0.04
Net (loss) income (in USD per share)	$ (0.85)	$ 0.03	$ (0.88)	$ (0.11)
Denominator (in thousands):
Weighted average common shares outstanding - basic (in shares)	159,931	135,569	150,535	135,758
Weighted average common shares outstanding - diluted (in shares)	159,931	137,306	150,535	135,758
Continued operations (in USD per share)	$ (0.82)	$ 0.02	$ (1.06)	$ (0.15)
Discontinued operations (in USD per share)	(0.03)	0.01	0.18	0.04
Net (loss) income (in USD per share)	$ (0.85)	$ 0.03	$ (0.88)	$ (0.11)
Performance-based RSUs
Denominator (in thousands):
Dilutive effect (in shares)	0	618	0	0
Time-based RSUs
Denominator (in thousands):
Dilutive effect (in shares)	0	200	0	0
Stock Options
Denominator (in thousands):
Dilutive effect (in shares)	0	919	0	0