Equity Activity - Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive loss		$ (3.7)	$ (3.8)	$ (7.1)	$ (4.5)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period		(12.6)		(8.8)
Other comprehensive (loss) income before reclassifications		(4.0)		(7.8)
Amounts reclassified from AOCI to SG&A	[1]	0.0		0.0
Other comprehensive loss		(4.0)		(7.8)
Balance, end of period		(16.6)		(16.6)
Pension Liability Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period		(26.5)		(26.9)
Other comprehensive (loss) income before reclassifications		(0.1)		(0.4)
Amounts reclassified from AOCI to SG&A	[1]	0.4		1.1
Other comprehensive loss		0.3		0.7
Balance, end of period		(26.2)		(26.2)
Total Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period		(39.1)		(35.7)
Other comprehensive (loss) income before reclassifications		(4.1)		(8.2)
Amounts reclassified from AOCI to SG&A	[1]	0.4		1.1
Other comprehensive loss		(3.7)		(7.1)
Balance, end of period		$ (42.8)		$ (42.8)

[1] For additional information, see Note L, "Pension, Profit Sharing & Other Post-Retirement Benefits".