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Pension Benefit Obligations - Equity Recognition (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
United States
Reconciliation of amounts in consolidated statements of stockholders' equity:
Prior service (cost) credit	$ (0.1)	$ (0.1)	$ (0.7)
Net loss	(116.5)	(134.5)	(122.4)
Total recognized in accumulated other comprehensive loss	(116.6)	(134.6)	(123.1)
International
Reconciliation of amounts in consolidated statements of stockholders' equity:
Prior service (cost) credit	(1.6)	(1.2)	(1.2)
Net loss	(279.5)	(297.7)	(233.0)
Total recognized in accumulated other comprehensive loss	$ (281.1)	$ (298.9)	$ (234.2)

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- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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