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Commitments and Contingent Liabilities (Details) $ in Millions		1 Months Ended	12 Months Ended
	Apr. 16, 2013 state relator defendant	Jan. 31, 2017 USD ($)	Mar. 31, 2017 USD ($) site	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Payments for legal settlements			$ 150.0	$ 0.0	$ 0.0
Anti-Kickback Claim
Loss Contingencies [Line Items]
Number of relators | relator	2
Number of states filed on behalf of | state	21
Number of additional defendants | defendant	5
Environmental Litigation
Loss Contingencies [Line Items]
Number of sites | site			5
Remediation costs			$ 10.4
Hazardous substance sites, number | site			13
Estimated environmental assessment and cleanup costs			$ 1,380.0
Estimated loss			$ 24.3
Environmental Litigation | Minimum
Loss Contingencies [Line Items]
Time frame of disbursements			Apr. 01, 2017
Environmental Litigation | Maximum
Loss Contingencies [Line Items]
Time frame of disbursements			Mar. 31, 2047
Drug Enforcement Administration, Department of Justice and U.S. Attorneys' Investigative Claims
Loss Contingencies [Line Items]
Litigation pre-tax charge					$ 150.0
Payments for legal settlements		$ 150.0

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