Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Statement of Comprehensive Income [Abstract]
Net earnings	$ 6.8	$ 2.8	$ 10.5	$ 5.3
Other comprehensive income, net of tax:
Foreign currency translation adjustments, net of tax expense of $0.1 million, expense of $0.1 million, tax benefit of $0.2 million, and tax expense of $0.3 million, respectively	2.7	1.8	(5.7)	2.2
Less: Reclassification adjustments included in net earnings	0.0	0.0	(0.2)	0.0
Foreign currency translation adjustments	2.7	1.8	(5.9)	2.2
Unrealized gains on investment, net of tax expense of $2.1 million, $6.5 million, $3.8 million and $6.2 million, respectively	3.5	10.6	6.6	10.5
Other comprehensive income	6.2	12.4	0.7	12.7
Comprehensive income	$ 13.0	$ 15.2	$ 11.2	$ 18.0