Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 23.0	$ 80.9	$ 53.9	$ 101.0
Other comprehensive income, net of tax:
Foreign currency translation adjustments, net of tax expense of $0.2, tax benefit of $1.8, tax expense of $0.3 and tax benefit of $1.7, respectively	3.4	1.8	16.0	13.1
Less: Reclassification adjustments included in net earnings	0.0	0.2	0.0	(0.1)
Foreign currency translation adjustments	3.4	2.0	16.0	13.0
Unrealized gains on investment, net of tax expense of $12.9, $0.6, $21.9 and $4.3, respectively	28.8	1.3	48.6	8.8
Other comprehensive income	32.2	3.3	64.6	21.8
Comprehensive income	$ 55.2	$ 84.2	$ 118.5	$ 122.8