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Pension Benefit Obligations - Asset Categories (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Post-retirement plan      
Fair values of plan assets $ 1,421.4 $ 1,463.5  
Cash and cash equivalents      
Post-retirement plan      
Fair values of plan assets 71.7 22.9  
Equity and debt securities      
Post-retirement plan      
Fair values of plan assets 153.4 7.9  
Diversified and equity funds      
Post-retirement plan      
Fair values of plan assets 152.0 180.0  
Fixed Income Funds      
Post-retirement plan      
Fair values of plan assets 55.3 153.7  
Hedge Funds      
Post-retirement plan      
Fair values of plan assets 15.0 14.0  
Common collective funds      
Post-retirement plan      
Fair values of plan assets 951.0 1,068.9  
Assets held by Insurance Company      
Post-retirement plan      
Fair values of plan assets 30.0 31.3  
Derivative instruments      
Post-retirement plan      
Fair values of plan assets (7.0) (15.2)  
Level 1      
Post-retirement plan      
Fair values of plan assets 276.5 29.2  
Level 1 | Cash and cash equivalents      
Post-retirement plan      
Fair values of plan assets 37.1 13.1  
Level 1 | Equity and debt securities      
Post-retirement plan      
Fair values of plan assets 153.4 6.2  
Level 1 | Diversified and equity funds      
Post-retirement plan      
Fair values of plan assets 82.4 6.4  
Level 1 | Fixed Income Funds      
Post-retirement plan      
Fair values of plan assets 3.6 3.5  
Level 2      
Post-retirement plan      
Fair values of plan assets 148.9 320.1  
Level 2 | Cash and cash equivalents      
Post-retirement plan      
Fair values of plan assets 34.6 9.8  
Level 2 | Equity and debt securities      
Post-retirement plan      
Fair values of plan assets   1.7  
Level 2 | Diversified and equity funds      
Post-retirement plan      
Fair values of plan assets 69.6 173.6  
Level 2 | Fixed Income Funds      
Post-retirement plan      
Fair values of plan assets 51.7 150.2  
Level 2 | Derivative instruments      
Post-retirement plan      
Fair values of plan assets (7.0) (15.2)  
Level 3      
Post-retirement plan      
Fair values of plan assets 45.0 45.3 $ 43.3
Level 3 | Hedge Funds      
Post-retirement plan      
Fair values of plan assets 15.0 14.0  
Level 3 | Assets held by Insurance Company      
Post-retirement plan      
Fair values of plan assets 30.0 31.3  
Investments measured at NAV      
Post-retirement plan      
Fair values of plan assets 951.0 1,068.9  
Investments measured at NAV | Common collective funds      
Post-retirement plan      
Fair values of plan assets $ 951.0 $ 1,068.9