Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Dec. 27, 2014
Income Tax Disclosure [Abstract]
Effective tax rate	28.40%	26.20%
Gross unrecognized tax benefit	$ 20.2		$ 22.5
Unrecognized tax benefits that would impact effective tax rate, if recognized	18.2
Accrued interest and penalties related to uncertain tax positions	4.9		6.5
Unrecognized Tax Benefits, Period Increase (Decrease)	(2.3)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Period Increase (Decrease)	(1.3)
Significant Change in Unrecognized Tax Benefits Reasonably Possible, Amount of Unrecorded Benefit	$ (1.0)