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Financial Instruments - (Carrying Values And Fair Values Of Debt Instruments) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012
Senior Unsecured Notes Due June 2018 (Level 2) [Member]
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments [Line Items]
Senior unsecured notes due, Carrying value	$ 299.0	$ 298.9
Senior unsecured notes due, Fair value	363.5	368.4
Senior Unsecured Notes Due February 2022 (Level 2) [Member]
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments [Line Items]
Senior unsecured notes due, Carrying value	497.6	497.4
Senior unsecured notes due, Fair value	521.3	506.6
Senior Unsecured Notes Due December 2022 (Level 2) [Member]
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments [Line Items]
Senior unsecured notes due, Carrying value	297.7
Senior unsecured notes due, Fair value	308.0
Term Loan Due November 2015 (Level 3) [Member]
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments [Line Items]
Senior unsecured notes due, Carrying value	200.0
Senior unsecured notes due, Fair value	$ 200.3

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.

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