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Discontinued Operations, Assets Held for Sale and Divestitures (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 02, 2012 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Restructuring Charges |  |  |  |  |  |  |  |  |  |  | $ 9.2 | $ 3.1 | $ 1.5
Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  | 11.6 | 0.0 | 0.0
Revenue, Net |  | $ 311.4 | $ 301.0 | $ 290.3 | $ 261.8 | $ 320.7 | $ 318.5 | $ 288.1 | $ 257.4 |  | 1,164.5 | 1,184.7 | $ 1,120.8
Multiemployer Plans, Withdrawal Obligation |  | $ 0.9 |  |  |  |  |  |  |  |  | 0.9 |  |
Gain (Loss) on Sale of Assets and Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  | 2.5 |  |
QUEBEC |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  |  |  |  |  | 7.2 |  |
Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  | 2.5 |  |
Environmental Remediation Expense |  |  |  |  |  |  |  |  |  |  | 2.3 |  |
Severance Costs |  |  |  |  |  |  |  |  |  |  | 2.4 |  |
Revenue, Net |  |  |  |  |  |  |  |  |  |  |  | $ 11.5 |
U.S. Pipe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses | $ 94.0 |  |  |  |  |  |  |  |  |  | $ 4.5 |  |
Noncash or Part Noncash Divestiture, Amount of Consideration Received |  |  |  |  |  |  |  |  |  | $ 10.1 |  |  |

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