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Pension Benefit Obligations - Excess of Plan Assets (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
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United States |  |  |
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets |  |  |
Projected benefit obligation | $ 679.5 | $ 610.4 | $ 658.4
Accumulated benefit obligation | 679.5 | 610.4 | 658.4
Fair values of plan assets | 454.8 | 451.5 | 466.4
Expected employer contributions in next fiscal year | 14.7 |  |
International |  |  |
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets |  |  |
Projected benefit obligation | 1,141.9 | 1,002.6 | 1,158.3
Accumulated benefit obligation | 1,132.7 | 991.9 | 1,145.7
Fair values of plan assets | 871.2 | $ 760.7 | $ 804.2
Expected employer contributions in next fiscal year | $ 26.6 |  |

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