Other Long-Term Liabilities (Details) $ in Millions	Mar. 31, 2018 USD ($) ManufacturingSite	Mar. 31, 2017 USD ($)
Environmental Remediation Obligations [Abstract]
Amount by which unaccrued maximum of estimated range exceeds minimum	$ 98.5
Accruals for extended environmental-related activities	177.8	$ 161.6
Estimated costs of current investigation and remediation activities included in other accruals	$ 27.0	$ 20.0
Number of manufacturing sites accounting for the majority of the accrual for environmental-related activities | ManufacturingSite	4
Accruals for environmental-related activities of three sites	$ 160.9
Percentage of accrual for environmental-related activities related to three sites	78.60%
Amount of unaccrued maximum related to three sites	$ 77.4
Percentage of aggregate unaccrued maximum related to three sites	78.60%