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Retirement Benefits - Schedule of Allocation of Plan Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets $ 3,838.0 $ 3,753.1  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 115.7 100.8 $ 84.6
U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 2,817.8 2,781.3  
U.S. Plans | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 2,775.9 2,724.1  
U.S. Plans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 1,306.2 1,337.1  
U.S. Plans | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 1,468.8 1,386.1  
U.S. Plans | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.9 0.9  
U.S. Plans | Cash and cash equivalents | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 1.4 2.6  
U.S. Plans | Cash and cash equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 1.4 2.6  
U.S. Plans | Cash and cash equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Cash and cash equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Mutual funds | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 112.4 129.7  
U.S. Plans | Mutual funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 112.4 129.7  
U.S. Plans | Mutual funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Mutual funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Common stock | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 947.7 919.7  
U.S. Plans | Common stock | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 947.7 919.7  
U.S. Plans | Common stock | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Common stock | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Common collective trusts | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 467.4 419.0  
U.S. Plans | Common collective trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0    
U.S. Plans | Common collective trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 467.4 419.0  
U.S. Plans | Common collective trusts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Corporate debt | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 699.3 698.7  
U.S. Plans | Corporate debt | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Corporate debt | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 699.3 698.7  
U.S. Plans | Corporate debt | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Government securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 377.8 415.1  
U.S. Plans | Government securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 244.7 285.1  
U.S. Plans | Government securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 133.1 130.0  
U.S. Plans | Government securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Common collective trusts | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 169.0 138.4  
U.S. Plans | Common collective trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Common collective trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 169.0 138.4  
U.S. Plans | Common collective trusts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Insurance contracts | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.9 0.9  
U.S. Plans | Insurance contracts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Insurance contracts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
U.S. Plans | Insurance contracts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.9 0.9 0.9
U.S. Plans | Private equity | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 23.5 31.6  
U.S. Plans | Alternative equity | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 18.4 25.6  
Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 1,020.2 971.8  
Non-U.S. Plans | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 1,004.9 961.7  
Non-U.S. Plans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 65.4 81.3  
Non-U.S. Plans | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 824.7 780.5  
Non-U.S. Plans | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 114.8 99.9  
Non-U.S. Plans | Cash and cash equivalents | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 1.9 16.6  
Non-U.S. Plans | Cash and cash equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 1.9 16.6  
Non-U.S. Plans | Cash and cash equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Cash and cash equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Common stock | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 62.4 63.4  
Non-U.S. Plans | Common stock | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 62.4 63.4  
Non-U.S. Plans | Common stock | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Common stock | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Common collective trusts | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 329.3 304.5  
Non-U.S. Plans | Common collective trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Common collective trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 329.3 304.5  
Non-U.S. Plans | Common collective trusts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Corporate debt | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 65.6 61.2  
Non-U.S. Plans | Corporate debt | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Corporate debt | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 65.6 61.2  
Non-U.S. Plans | Corporate debt | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Government securities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 1.1 1.3  
Non-U.S. Plans | Government securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 1.1 1.3  
Non-U.S. Plans | Government securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Common collective trusts | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 350.9 329.7  
Non-U.S. Plans | Common collective trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Common collective trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 350.9 329.7  
Non-U.S. Plans | Common collective trusts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Real estate funds | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 78.9 85.1  
Non-U.S. Plans | Real estate funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Real estate funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 78.9 85.1  
Non-U.S. Plans | Real estate funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 15.3 10.1  
Non-U.S. Plans | Insurance contracts | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 110.2 95.4  
Non-U.S. Plans | Insurance contracts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Insurance contracts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Insurance contracts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 110.2 95.4 79.1
Non-U.S. Plans | Other | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 4.6 4.5  
Non-U.S. Plans | Other | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Other | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0.0 0.0  
Non-U.S. Plans | Other | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets $ 4.6 $ 4.5 $ 4.6