CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 49.2	$ 4.0	$ 127.2	$ (65.1)
Other comprehensive (loss) income:
Net change in cumulative translation adjustment, net of tax	(25.6)	(11.8)	(22.2)	(21.8)
Net change in available-for-sale investments, net of tax:
Unrealized holding (loss) gain arising during period	(10.2)	71.4	74.2	153.1
Less: reclassification adjustments included in net income (loss)	(52.7)	0.0	(134.2)	0.0
Net change in defined benefit obligation, net of tax:
Amortization of actuarial losses	0.4	0.1	0.9	0.3
Net change in Accumulated other comprehensive (loss) income	(88.1)	59.7	(81.3)	131.6
Comprehensive (loss) income	$ (38.9)	$ 63.7	$ 45.9	$ 66.5