Earnings (Loss) Per Common Share (Reconciliation Of The Numerator And Denominator Of Earnings (Loss) Per Common Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 26, 2014		Sep. 27, 2013		Sep. 26, 2014		Sep. 27, 2013
Earnings Per Share [Abstract]
Net income for basic EPS computation	$ (124.2)		$ 5.7		$ (464.4)		$ (31.9)
Less: Net income allocated to participating securities	0	[1]	0.1		0	[1]	0.1
Net income (loss) for basic EPS computations	(124.2)	[2]	5.6	[2]	(464.4)	[2]	(32.0)	[2]
Weighted average shares outstanding for basic EPS computation	48.7	[3]	49.2	[3]	48.8	[3]	49.5	[3]
Earnings per common share - basic	$ (2.55)	[4]	$ 0.11	[4]	$ (9.52)	[4]	$ (0.64)	[4]
Add: preferred stock dividends, if applicable	0		0.1		0		0
Net income (loss) for diluted EPS computation	$ (124.2)	[2]	$ 5.8	[2]	$ (464.4)	[2]	$ (31.9)	[2]
Weighted average shares outstanding including nonvested shares	48.7	[3]	49.2	[3]	48.8	[3]	49.5	[3]
Dilutive effect of convertible notes	0		1.1		0		0
Dilutive effect of stock options and restricted stock units	0		0.4		0		0
Weighted average shares outstanding for diluted EPS computation	48.7	[3]	50.7	[3]	48.8	[3]	49.5	[3]
Earnings (loss) per common share – assuming dilution	$ (2.55)		$ 0.11		$ (9.52)		$ (0.64)

[1] Outstanding unvested share-based payment awards that contain rights to non-forfeitable dividends are considered participating securities in undistributed earnings in the calculation above.

[2] Numerator

[3] Denominator

[4] Under the two-class method, earnings (loss) per share – basic reflects undistributed earnings per share for both common stock and unvested share-based payment awards (restricted stock).