Stock-Based Compensation Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017
Stock-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	$ 14.0	$ 11.9	$ 40.5	$ 37.2
Income tax benefit	(3.0)	(4.0)	(8.6)	(13.0)
Total stock-based compensation expense	11.0	7.9	31.9	24.2
Stock Awards
Stock-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	8.5	7.2	24.1	22.6
Income tax benefit	(1.8)	(2.4)	(5.1)	(8.0)
Total stock-based compensation expense	6.7	4.8	19.0	14.6
Stock options
Stock-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	5.5	4.7	16.4	14.6
Income tax benefit	(1.2)	(1.6)	(3.5)	(5.0)
Total stock-based compensation expense	$ 4.3	$ 3.1	$ 12.9	$ 9.6

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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