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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	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)
Income before income taxes	$ 109.5
Income tax	$ (41.6)
Gain on sale, net of tax		$ 67.9

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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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