Stock-Based Compensation Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Stock-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	$ 14.6	$ 13.3	$ 26.5	$ 25.3
Income tax benefit	(3.1)	(4.9)	(5.6)	(9.0)
Total stock-based compensation expense	11.5	8.4	20.9	16.3
Stock Awards
Stock-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	8.5	8.0	15.6	15.4
Income tax benefit	(1.8)	(3.1)	(3.3)	(5.6)
Total stock-based compensation expense	6.7	4.9	12.3	9.8
Stock Options
Stock-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	6.1	5.3	10.9	9.9
Income tax benefit	(1.3)	(1.8)	(2.3)	(3.4)
Total stock-based compensation expense	$ 4.8	$ 3.5	$ 8.6	$ 6.5

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 amount of expense, net of income tax, 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.

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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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