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Pension Benefit Obligations - Asset Categories (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Post-retirement plan      
Fair values of plan assets $ 1,527.9 $ 1,421.4  
Cash and cash equivalents      
Post-retirement plan      
Fair values of plan assets 41.0 71.7  
Equity and debt securities      
Post-retirement plan      
Fair values of plan assets 115.5 153.4  
Diversified and equity funds      
Post-retirement plan      
Fair values of plan assets 192.8 152.0  
Fixed Income Funds      
Post-retirement plan      
Fair values of plan assets 95.7 55.3  
Hedge Funds      
Post-retirement plan      
Fair values of plan assets   15.0  
Common collective funds      
Post-retirement plan      
Fair values of plan assets 897.0 951.0  
Assets held by Insurance Company      
Post-retirement plan      
Fair values of plan assets 26.8 30.0  
Derivative instruments      
Post-retirement plan      
Fair values of plan assets 159.1 (7.0)  
Level 1      
Post-retirement plan      
Fair values of plan assets 342.9 276.5  
Level 1 | Cash and cash equivalents      
Post-retirement plan      
Fair values of plan assets 26.4 37.1  
Level 1 | Equity and debt securities      
Post-retirement plan      
Fair values of plan assets 115.5 153.4  
Level 1 | Diversified and equity funds      
Post-retirement plan      
Fair values of plan assets 179.0 82.4  
Level 1 | Fixed Income Funds      
Post-retirement plan      
Fair values of plan assets 22.0 3.6  
Level 2      
Post-retirement plan      
Fair values of plan assets 261.2 148.9  
Level 2 | Cash and cash equivalents      
Post-retirement plan      
Fair values of plan assets 14.6 34.6  
Level 2 | Diversified and equity funds      
Post-retirement plan      
Fair values of plan assets 13.8 69.6  
Level 2 | Fixed Income Funds      
Post-retirement plan      
Fair values of plan assets 73.7 51.7  
Level 2 | Derivative instruments      
Post-retirement plan      
Fair values of plan assets 159.1 (7.0)  
Level 3      
Post-retirement plan      
Fair values of plan assets 26.8 45.0 $ 45.3
Level 3 | Hedge Funds      
Post-retirement plan      
Fair values of plan assets   15.0  
Level 3 | Assets held by Insurance Company      
Post-retirement plan      
Fair values of plan assets 26.8 30.0  
Investments measured at NAV      
Post-retirement plan      
Fair values of plan assets 897.0 951.0  
Investments measured at NAV | Common collective funds      
Post-retirement plan      
Fair values of plan assets $ 897.0 $ 951.0