Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Statement of Comprehensive Income [Abstract]
Net earnings	$ 9.1	$ 1.4	$ 19.6	$ 6.7
Other comprehensive income, net of tax:
Foreign currency translation adjustments, net of tax benefit of $0.2 million, $0.3 million, $0.4 million, and tax expense of $0.0 million, respectively	(9.8)	(12.6)	(15.5)	(10.4)
Less: Reclassification adjustments included in net earnings	0.0	(0.6)	(0.2)	(0.6)
Foreign currency translation adjustments	(9.8)	(13.2)	(15.7)	(11.0)
Unrealized gains (losses) on investment, net of tax expense of $8.9 million, tax benefit of $0.4 million and tax expense of $12.7 million and $5.8 million, respectively	16.4	(1.9)	23.0	8.6
Other comprehensive income (loss)	6.6	(15.1)	7.3	(2.4)
Comprehensive income (loss)	$ 15.7	$ (13.7)	$ 26.9	$ 4.3