Summary of Significant Accounting Policies (Recently Issued Accounting Standards) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2017	Mar. 31, 2017
Accounting Policies [Abstract]
Employee Service Share-based Compensation, Tax Benefit Recognized	$ 3.8	$ 4.3

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

No definition available.

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