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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, 2017
Sep. 30, 2016
Sep. 30, 2015
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 257.0 $ 245.2 $ 226.1
Level 3 | Real Estate Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 207.8 192.1 174.2
Level 3 | Other Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7.8 7.3 6.6
Level 3 | Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 41.4 45.8 45.3
U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,869.2 2,705.3 2,613.6
U.S. | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13.6 12.7  
U.S. | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 598.6 637.0  
U.S. | Equity Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 276.5 300.2  
U.S. | Equity Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 787.0 815.5  
U.S. | Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 985.7 747.8  
U.S. | Real Estate Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 207.8 192.1  
U.S. | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 888.7 949.9  
U.S. | Level 1 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13.6 12.7  
U.S. | Level 1 | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 598.6 637.0  
U.S. | Level 1 | Equity Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 276.5 300.2  
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 | Real Estate Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,772.7 1,563.3  
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 787.0 815.5  
U.S. | Level 2 | Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 985.7 747.8  
U.S. | Level 2 | Real Estate Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 207.8 192.1  
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 | Real Estate Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 207.8 192.1  
International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,540.0 1,411.1 $ 1,302.8
International | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7.3 6.6  
International | Equity Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 821.4 854.8  
International | Fixed Income Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 651.3 486.9  
International | Other Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 18.6 17.0  
International | Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 41.4 45.8  
International | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7.3 6.6  
International | Level 1 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7.3 6.6  
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 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 1,483.5 1,351.4  
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 821.4 854.8  
International | Level 2 | Fixed Income Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 651.3 486.9  
International | Level 2 | Other Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10.8 9.7  
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 49.2 53.1  
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 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 7.8 7.3  
International | Level 3 | Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 41.4 $ 45.8