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Retirement Benefits (Pension Plan Assets at Fair Value by Asset Class) (Details) - Defined Benefit Pension Plan - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 217.7 $ 49.2 $ 53.1
Level 3 | Other pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 7.8 7.3
Level 3 | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 217.7 41.4 45.8
U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,684.9 2,869.2 2,705.3
U.S. | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13.8 13.6  
U.S. | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 397.9 598.6  
U.S. | Equity mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 173.8 276.5  
U.S. | Equity pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 545.2 787.0  
U.S. | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,344.6 985.7  
U.S. | US pension plans at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,475.3 2,661.4  
U.S. | Real estate pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 209.6 207.8  
U.S. | Level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13.8 13.6  
U.S. | Level 1 | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 397.9 598.6  
U.S. | Level 1 | Equity mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 173.8 276.5  
U.S. | Level 1 | Equity pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. | Level 1 | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. | Level 1 | US pension plans at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 585.5 888.7  
U.S. | Level 2 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. | Level 2 | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. | Level 2 | Equity mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. | Level 2 | Equity pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 545.2 787.0  
U.S. | Level 2 | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,344.6 985.7  
U.S. | Level 2 | US pension plans at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,889.8 1,772.7  
U.S. | Level 3 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. | Level 3 | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. | Level 3 | Equity mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. | Level 3 | Equity pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. | Level 3 | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. | Level 3 | US pension plans at fair value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,588.2 1,540.0 $ 1,411.1
International | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 15.8 7.3  
International | Equity pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 727.9 821.4  
International | Fixed income pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 615.2 651.3  
International | Other pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11.6 18.6  
International | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 217.7 41.4  
International | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 15.8 7.3  
International | Level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 15.8 7.3  
International | Level 1 | Equity pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
International | Level 1 | Fixed income pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
International | Level 1 | Other pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
International | Level 1 | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
International | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,354.7 1,483.5  
International | Level 2 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
International | Level 2 | Equity pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 727.9 821.4  
International | Level 2 | Fixed income pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 615.2 651.3  
International | Level 2 | Other pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11.6 10.8  
International | Level 2 | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
International | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 217.7 49.2  
International | Level 3 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
International | Level 3 | Equity pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
International | Level 3 | Fixed income pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
International | Level 3 | Other pooled funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 7.8  
International | Level 3 | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 217.7 $ 41.4