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Discontinued Operations, Assets Held for Sale and Divestitures (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Other Cost and Expense, Operating									$ 8.3	$ 9.2	$ 3.1
Asset Impairment Charges									0.0	11.6	0.0
Revenue, Net	$ 302.5	$ 310.1	$ 283.6	$ 242.7	$ 311.4	$ 301.0	$ 290.3	$ 261.8	1,138.9	1,164.5	$ 1,184.7
Multiemployer Plans, Withdrawal Obligation	$ 0.9								0.9
Gain (Loss) on Sale of Assets and Asset Impairment Charges									2.5
Statesboro [Member]
Other Cost and Expense, Operating									4.1
QUEBEC
Restructuring Charges									7.2
Asset Impairment Charges									2.5
Environmental Remediation Expense									2.3
Severance Costs									$ 2.4
Revenue, Net										$ 11.5

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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