Earnings (Loss) 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		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Amounts attributable to the Company – basic and diluted:
Net income (loss) attributable to Company common shareholders	$ (70.8)	$ 29.8	$ (58.4)	$ 25.1
Net income (loss) for EPS computations	$ (70.8)	$ 29.8	$ (58.4)	$ 25.1
Weighted average shares outstanding for basic EPS computation (in shares)	50.0	49.6	49.9	49.5
Earnings (loss) per common share attributable to Company common shareholders – basic (per share)	$ (1.42)	$ 0.60	$ (1.17)	$ 0.51
Weighted average shares outstanding including nonvested shares (in shares)	50.0	49.6	49.9	49.5
Dilutive effect of stock options and restricted stock units	0.0	2.5	0.0	2.5
Weighted average shares outstanding for diluted EPS computation (in shares)	50.0	52.1	49.9	52.0
Earnings (loss) per common share attributable to Company common shareholders – assuming dilution (per share)	$ (1.42)	$ 0.57	$ (1.17)	$ 0.48