Summary of Significant Accounting Policies (Other Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Dec. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Accounting Policies [Abstract]
Sale of businesses	$ 4.5	$ 4.5	$ 0.0

Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities.

No definition available.

Name:	us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration