Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income by Component, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 02, 2017	Apr. 03, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,012.0
Other comprehensive income	24.6	$ 3.5
Ending balance	1,049.7	910.8
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(23.3)	(22.6)
Other comprehensive income (loss) before reclassifications	5.7	11.9
Amounts reclassified from accumulated other comprehensive income	0.0	(0.3)
Other comprehensive income	5.7	11.6
Ending balance	(17.6)	(11.0)
Unrealized Gains and Losses on Investment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	83.8	84.9
Other comprehensive income (loss) before reclassifications	18.9	(8.1)
Amounts reclassified from accumulated other comprehensive income	0.0	0.0
Other comprehensive income	18.9	(8.1)
Ending balance	102.7	76.8
Pension Liability Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1.8)	(1.6)
Other comprehensive income (loss) before reclassifications	0.0	0.0
Amounts reclassified from accumulated other comprehensive income	0.0	0.0
Other comprehensive income	0.0	0.0
Ending balance	(1.8)	(1.6)
Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	58.7	60.7
Other comprehensive income (loss) before reclassifications	24.6	3.8
Amounts reclassified from accumulated other comprehensive income	0.0	(0.3)
Other comprehensive income	24.6	3.5
Ending balance	$ 83.3	$ 64.2