Other Long-Term Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012 ManufacturingSites	Mar. 31, 2011
Other Long-Term Liabilities (Textual) [Abstract]
Amount by which unaccrued maximum of estimated range exceeds minimum	$ 97.8
Accruals for extended environmental-related activities	84.7	90.7
Estimated costs of current investigation and remediation activities included in Other accruals	42.8	60.1
Number of manufacturing sites accounting for the majority of the accrual for environmental-related activities	4
Accruals for environmental-related activities of four sites	86.7
Percentage of accrual for environmental-related activities related to four sites	68.00%
Amount of unaccrued maximum related to four sites	$ 67.7
Percentage of aggregate unaccrued maximum related to four sites	69.20%