Stock-Based Compensation Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	$ 13.3	$ 10.9	$ 25.3	$ 22.4
Income tax benefit	(4.9)	(3.8)	(9.0)	(7.6)
Total stock-based compensation expense	8.4	7.1	16.3	14.8
Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	8.0	7.1	15.4	14.2
Income tax benefit	(3.1)	(2.5)	(5.6)	(4.8)
Total stock-based compensation expense	4.9	4.6	9.8	9.4
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	5.3	3.8	9.9	8.2
Income tax benefit	(1.8)	(1.3)	(3.4)	(2.8)
Total stock-based compensation expense	$ 3.5	$ 2.5	$ 6.5	$ 5.4

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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