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Other Bond Issuances (Details) (Bonds [Member], USD $) In Millions, unless otherwise specified		3 Months Ended
	Jun. 30, 2013 Subsidiaries [Member]	Jun. 30, 2013 Parent [Member]	May 23, 2013 5.000% Series Due 2031 [Member] Subsidiaries [Member]	May 23, 2013 3.910% Series Due 2031 [Member] Subsidiaries [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 161.9
Debt Instrument, Interest Rate, Stated Percentage			5.01%	3.91%
Liabilities and Equity, Fair Value Adjustment		$ 18.0

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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