Summary of Significant Accounting Policies (Recently Issued Accounting Standards) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2017	Jun. 30, 2017
Accounting Policies [Abstract]
Employee Service Share-based Compensation, Tax Benefit Recognized	$ 1.3	$ 5.6

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

No definition available.

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