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Discontinued Operations, Assets Held for Sale and Divestitures Disposal Group, detail of Gain on Sale (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Jan. 06, 2017	Sep. 30, 2014
Disposal Group, Details of Gain on Sale [Line Items]
Disposal Group, Including Discontinued Operation, Consideration					$ 305.7
Discontinued Operations, Receivable from Buyer of Discontinued Operation					1.9	$ 11.8
Total proceeds					307.6
Transaction expenses					(8.3)
Net proceeds					299.3
Assets and liabilities disposed					$ (189.8)
Gain on sale, pre-tax	$ 109.5
Income tax	$ (41.6)
Gain on sale, net of tax		$ 67.9	$ 0.0	$ 0.0

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[Line Items] for Disposal Group, Details of Gain on Sale [Table]

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Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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