Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 29, 2015	Mar. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	$ (1.4)
Pension Costs [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(1.4)
Pension Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pre-tax amount	2.3	1.2
Tax	(0.9)	(0.4)
Net of tax	$ 1.4	$ 0.8