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Long-Term Debt And Notes Payable (Components Of Debt) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt	$ 749.2us-gaap_LongTermDebtNoncurrent	$ 749.2us-gaap_LongTermDebtNoncurrent
Long-term Commercial Paper	500
Commercial Paper	127us-gaap_CommercialPaper
Two Point Seven Five Percent Notes Due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	250.0	250.0
Four Point Four Five Percent Notes Due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	300.0	300.0
Six Point Five Five Percent Notes Due 2036 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 199.3	$ 199.3

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer).

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