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Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Long-Term Debt
Carrying amount of total long-term debt exclusive of capital leases	$ 687.5	$ 674.8
Fair market value	$ 737.9	$ 726.7

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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