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Other Long-Term Liabilities (Details)
$ in Millions
Mar. 31, 2019
USD ($)
ManufacturingSite
Mar. 31, 2018
USD ($)
Environmental Remediation Obligations [Abstract]    
Amount by which unaccrued maximum of estimated range exceeds minimum $ 116.4  
Accruals for extended environmental-related activities 319.0 $ 177.8
Estimated costs of current investigation and remediation activities included in other accruals $ 51.0 $ 27.0
Number of manufacturing sites accounting for the majority of the accrual for environmental-related activities | ManufacturingSite 4  
Accruals for environmental-related activities of sites $ 323.4  
Percentage of accrual for environmental-related activities related to sites 87.40%  
Amount of unaccrued maximum related to sites $ 92.8  
Percentage of aggregate unaccrued maximum related to sites 79.70%