Common Shares and Net Income (Loss) per Common Share - Reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Numerator:
Net loss from continuing operations	$ (27.4)	$ (22.7)
Net income from discontinued operations	30.9	3.0
Net income (loss)	$ 3.5	$ (19.7)
Denominator:
Weighted average common shares outstanding - basic (in shares)	141,139	135,948
Basic Earnings Per Share:
Continuing operations (in USD per share)	$ (0.19)	$ (0.17)
Discontinued operations (in USD per share)	0.22	0.03
Net income (loss) (in USD per share)	$ 0.02	$ (0.14)
Denominator:
Weighted average common shares outstanding - basic (in shares)	141,139	135,948
Weighted average common shares outstanding - diluted (in shares)	141,139	135,948
Continued operations (in USD per share)	$ (0.19)	$ (0.17)
Discontinued operations (in USD per share)	0.22	0.03
Net income (loss) (in USD per share)	$ 0.02	$ (0.14)
Performance-based RSUs
Denominator:
Dilutive effect (in shares)	0	0
Time-based RSUs
Denominator:
Dilutive effect (in shares)	0	0
Stock Options
Denominator:
Dilutive effect (in shares)	0	0