Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 33.1	$ 23.0	$ 46.8	$ 53.9
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax benefit of $0.9, tax expense of $0.2, tax benefit of $0.3 and tax expense of $0.3, respectively	(7.0)	3.4	(7.8)	16.0
Less: Reclassification adjustments included in net earnings	0.0	0.0	0.0	0.0
Foreign currency translation adjustments	(7.0)	3.4	(7.8)	16.0
Unrealized gains on investment, net of tax expense of $12.9 and $21.9 in 2017, respectively	0.0	28.8	0.0	48.6
Other comprehensive income (loss)	(7.0)	32.2	(7.8)	64.6
Comprehensive income	$ 26.1	$ 55.2	$ 39.0	$ 118.5