Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014	Dec. 31, 2014
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Provision (benefit) for income taxes	$ 5.3	$ 1.0	$ (3.0)	$ (16.3)
Effective tax rate (percentage)			8.90%	24.50%
Income tax at the federal statutory rate (percentage)			35.00%	35.00%
Increase in additional paid in capital due to income tax benefit from share based compensation			$ 0.5
Unrecognized tax benefits related to deductions for share-based compensation			4.8
Noncurrent liability for uncertain tax positions	19.5		19.5		$ 18.3
Unrecognized tax benefits	25.4		25.4		24.2
Unrecognized tax benefits that would impact effective tax rate	12.2		12.2		11.3
Interest on income taxes accrued	4.6		4.6		$ 4.1
Statute of Limitations Expected to Expire | State and Local Jurisdiction
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Amount of unrecorded benefit	$ 0.9		$ 0.9