Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 29.1	$ 12.2
Other comprehensive income, net of tax:
Foreign currency translation adjustments, net of tax expense of $0.0 in 2018 and $0.1 in 2017	14.0	5.7
Less: Reclassification adjustments included in net earnings	0.0	0.0
Foreign currency translation adjustments	14.0	5.7
Unrealized gains on investment, net of tax expense of $8.6 in 2017	0.0	18.9
Other comprehensive income	14.0	24.6
Comprehensive income	$ 43.1	$ 36.8