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Pension Plans (Schedule of Allocation of Plan Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]      
Assets Measured at Net Asset Value $ 11.4    
United States | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 463.5 $ 456.0 $ 477.2
Assets Measured at Net Asset Value 0.0 0.0  
United States | Pension Plan | U.S. Equity      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 66.0 67.7  
Assets Measured at Net Asset Value 64.6 65.5  
United States | Pension Plan | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 3.1 3.1  
Assets Measured at Net Asset Value 45.0 46.5  
United States | Pension Plan | U.S. Government      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 276.2 270.3  
United States | Pension Plan | Other Government      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 1.8 0.0  
Assets Measured at Net Asset Value   0.0  
United States | Pension Plan | Corporate      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
Assets Measured at Net Asset Value 0.0 0.0  
United States | Pension Plan | CASH & CASH EQUIVALENTS      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
United States | Pension Plan | OTHER      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 6.8 2.9  
United States | Pension Plan | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 69.1 70.8  
United States | Pension Plan | Level 1 | U.S. Equity      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 66.0 67.7  
United States | Pension Plan | Level 1 | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 3.1 3.1  
United States | Pension Plan | Level 1 | U.S. Government      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
United States | Pension Plan | Level 1 | Other Government      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
United States | Pension Plan | Level 1 | Corporate      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
United States | Pension Plan | Level 1 | CASH & CASH EQUIVALENTS      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
United States | Pension Plan | Level 1 | OTHER      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
United States | Pension Plan | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 284.8 273.2  
United States | Pension Plan | Level 2 | U.S. Equity      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
United States | Pension Plan | Level 2 | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
United States | Pension Plan | Level 2 | U.S. Government      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 276.2 270.3  
United States | Pension Plan | Level 2 | Other Government      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 1.8 0.0  
United States | Pension Plan | Level 2 | Corporate      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
United States | Pension Plan | Level 2 | CASH & CASH EQUIVALENTS      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
United States | Pension Plan | Level 2 | OTHER      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 6.8 2.9  
International Pension Plan Assets | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 122.8 131.6 $ 173.8
Assets Measured at Net Asset Value 12.1 17.1  
International Pension Plan Assets | Pension Plan | U.S. Equity      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 1.6  
Assets Measured at Net Asset Value 0.0 0.0  
International Pension Plan Assets | Pension Plan | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 8.7 5.9  
Assets Measured at Net Asset Value 28.9 41.8  
International Pension Plan Assets | Pension Plan | U.S. Government      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
International Pension Plan Assets | Pension Plan | Other Government      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 9.0 7.5  
Assets Measured at Net Asset Value   39.4  
International Pension Plan Assets | Pension Plan | Corporate      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 30.2 13.6  
Assets Measured at Net Asset Value 37.7 9.9  
International Pension Plan Assets | Pension Plan | CASH & CASH EQUIVALENTS      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 2.5 6.0  
International Pension Plan Assets | Pension Plan | OTHER      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 5.8 5.9  
International Pension Plan Assets | Pension Plan | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
International Pension Plan Assets | Pension Plan | Level 1 | U.S. Equity      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
International Pension Plan Assets | Pension Plan | Level 1 | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
International Pension Plan Assets | Pension Plan | Level 1 | U.S. Government      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
International Pension Plan Assets | Pension Plan | Level 1 | Other Government      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
International Pension Plan Assets | Pension Plan | Level 1 | Corporate      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
International Pension Plan Assets | Pension Plan | Level 1 | CASH & CASH EQUIVALENTS      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
International Pension Plan Assets | Pension Plan | Level 1 | OTHER      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
International Pension Plan Assets | Pension Plan | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 56.2 40.5  
International Pension Plan Assets | Pension Plan | Level 2 | U.S. Equity      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 1.6  
International Pension Plan Assets | Pension Plan | Level 2 | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 8.7 5.9  
International Pension Plan Assets | Pension Plan | Level 2 | U.S. Government      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 0.0 0.0  
International Pension Plan Assets | Pension Plan | Level 2 | Other Government      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 9.0 7.5  
International Pension Plan Assets | Pension Plan | Level 2 | Corporate      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 30.2 13.6  
International Pension Plan Assets | Pension Plan | Level 2 | CASH & CASH EQUIVALENTS      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value 2.5 6.0  
International Pension Plan Assets | Pension Plan | Level 2 | OTHER      
Defined Benefit Plan Disclosure [Line Items]      
Assets at estimated fair value $ 5.8 $ 5.9