Earnings Per Common Share (Reconciliation Of The Numerator And Denominator Of Earnings (Loss) Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Dec. 31, 2015	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net income (loss) attributable to Company common shareholders	$ (104.6)	$ (14.3)	$ 29.8	$ (4.7)	$ (47.9)	$ (29.0)	$ (6.9)	$ (38.1)	$ (93.8)	$ (121.9)	$ (627.6)
Net income (loss) for basic EPS computations									$ (93.8)	$ (121.9)	$ (627.6)
Weighted average shares outstanding including nonvested shares									49.6	48.9	48.8
Earnings (loss) per common share attributable to Company common shareholders – basic	$ (2.10)	$ (0.29)	$ 0.60	$ (0.10)	$ (0.98)	$ (0.59)	$ (0.14)	$ (0.78)	$ (1.89)	$ (2.49)	$ (12.86)
Weighted average shares outstanding including nonvested shares									49.6	48.9	48.8
Weighted average shares outstanding for diluted EPS computation									49.6	48.9	48.8
Earnings (loss) per common share attributable to Company common shareholders – assuming dilution	$ (2.10)	$ (0.29)	$ 0.57	$ (0.10)	$ (0.98)	$ (0.59)	$ (0.14)	$ (0.78)	$ (1.89)	$ (2.49)	$ (12.86)