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Pension Benefit Obligations - Equity Recognition (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
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United States |  |  |
Reconciliation of amounts in consolidated statements of stockholders' equity: |  |  |
Prior service (cost) credit | $ (0.8) | $ (0.2) | $ (0.2)
Net loss | (72.5) | (94.6) | (129.6)
Total recognized in accumulated other comprehensive loss | (73.3) | (94.8) | (129.8)
Foreign Pension Plan, Defined Benefit |  |  |
Reconciliation of amounts in consolidated statements of stockholders' equity: |  |  |
Prior service (cost) credit | 4.1 | 4.4 | 4.4
Net loss | (186.4) | (263.7) | (343.3)
Total recognized in accumulated other comprehensive loss | $ (182.3) | $ (259.3) | $ (338.9)

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