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Other Long-Term Liabilities (Details)
$ in Millions
Sep. 30, 2018
USD ($)
ManufacturingSite
Sep. 30, 2017
USD ($)
Environmental Remediation Obligations [Abstract]    
Amount by which unaccrued maximum of estimated range exceeds minimum $ 99.6  
Accruals for extended environmental-related activities 209.9 $ 162.9
Estimated costs of current investigation and remediation activities included in other accruals $ 27.0 $ 32.6
Number of manufacturing sites accounting for the majority of the accrual for environmental-related activities | ManufacturingSite 4  
Accruals for environmental-related activities of sites $ 188.2  
Percentage of accrual for environmental-related activities related to sites 79.40%  
Amount of unaccrued maximum related to sites $ 82.2  
Percentage of aggregate unaccrued maximum related to sites 82.50%