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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Fair Value Disclosures [Abstract]
Carrying value of long-term debt	$ 3,428.7us-gaap_LongTermDebt	$ 3,613.6us-gaap_LongTermDebt
Estimated fair value of long-term debt	$ 3,664.2us-gaap_LongTermDebtFairValue	$ 3,864.4us-gaap_LongTermDebtFairValue

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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