Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31931-109318

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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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Summary of Significant Accounting Policies - Adoption of New Accounting Standard - Employee Share-based Payments (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Accounting Policies [Abstract]
Income tax benefits associated with share-based payments	$ 2.6	$ 9.6
Retained Earnings
New Accounting Pronouncement, Early Adoption [Line Items]
Cumulative effect of change in accounting for employee share-based payments			$ 5.0	$ 0.0
Accounting Standards Update 2016-09 \| New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncement, Early Adoption [Line Items]
Decrease in deferred income tax liabilities for excess tax benefits related to prior periods			5.0
Accounting Standards Update 2016-09 \| New Accounting Pronouncement, Early Adoption, Effect \| Retained Earnings
New Accounting Pronouncement, Early Adoption [Line Items]
Cumulative effect of change in accounting for employee share-based payments			$ 5.0