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Stock Based Compensation Expense (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock-based Payment Award
Stock-based compensation expense		$ 88.0	$ 72.6	$ 56.7
Tax benefit		32.1	26.3	20.6
Employee Stock Option
Stock-based Payment Award
Stock-based compensation expense		0.2	1.0	2.1
Stock-settled awards
Stock-based Payment Award
Stock-based compensation expense		16.0	11.6	10.0
Cash-settled awards
Stock-based Payment Award
Stock-based compensation expense		0.9	0.7	0.6
Performance-based awards
Stock-based Payment Award
Stock-based compensation expense		69.4	57.7	42.2
Employee stock purchase plan
Stock-based Payment Award
Stock-based compensation expense		0.7	0.7	0.6
Other
Stock-based Payment Award
Stock-based compensation expense	[1]	$ 0.8	$ 0.9	$ 1.2
[1] Represents charges recorded for severance expense related to stock-based compensation awards.

X

- Definition

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.

+ References

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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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 20
-Section 55
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11283-113907

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- Definition

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.

+ References

No definition available.

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