XML 39 R52.htm IDEA: XBRL DOCUMENT

Financial Instruments (Carrying Values And Fair Values Of Fixed-Rate Debt Instruments) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Senior Unsecured Notes Due June 2018 (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior unsecured notes due, Carrying value	$ 299.1	$ 298.9
Senior unsecured notes due, Fair value	350.9	368.4
Senior Unsecured Notes Due February 2022 (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior unsecured notes due, Carrying value	497.6	497.4
Senior unsecured notes due, Fair value	517.9	506.6
Senior Unsecured Notes Due December 2022 (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior unsecured notes due, Carrying value	297.8
Senior unsecured notes due, Fair value	$ 316.8

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date.

+ References+ Details