Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2016	Jun. 28, 2015	Jul. 03, 2016	Jun. 28, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 8.9	$ 6.8	$ 20.1	$ 10.5
Other comprehensive income, net of tax:
Foreign currency translation adjustments, net of tax benefit of $0.1 million, tax expense of $0.1 million and $0.1 million and tax benefit of $0.2 million, respectively	(0.6)	2.7	11.3	(5.7)
Less: Reclassification adjustments included in net earnings	0.0	0.0	(0.3)	(0.2)
Foreign currency translation adjustments	(0.6)	2.7	11.0	(5.9)
Unrealized gains on investment, net of tax expense of $7.7 million, $2.1 million, $3.7 million and $3.8 million, respectively	15.6	3.5	7.5	6.6
Other comprehensive income	15.0	6.2	18.5	0.7
Comprehensive income	$ 23.9	$ 13.0	$ 38.6	$ 11.2