Long-Term Debt And Notes Payable (Components Of Debt) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	5.00%
Long-term Commercial Paper	$ 500.0
number of days to maturity	397
Net decrease in short-term debt	$ 28.5	$ 126.7
Long-term debt	744.8		$ 744.6
Short-term borrowings	$ 78.1		$ 49.6
2.75% Notes Due 2018
Debt Instrument [Line Items]
Maturity Year Of Debt Instrument	2018
Debt Instrument, Interest Rate, Stated Percentage	2.75%		2.75%
Long-term debt	$ 248.9		$ 248.8
Debt Instrument, Face Amount	250.0		250.0
Debt Issuance Cost	(1.1)		(1.2)
Other Liabilities [Member]
Debt Instrument [Line Items]
Long-term debt	0.6		0.6
Commercial Paper [Member]
Debt Instrument [Line Items]
Long-term debt	77.5		49.0
Six Point Five Five Percent Notes Due 2036 [Member]
Debt Instrument [Line Items]
Long-term debt	197.9		197.9
Debt Instrument, Face Amount	200.0		200.0
Debt Instrument, Unamortized Discount	(0.7)		(0.7)
Debt Issuance Cost	(1.4)		(1.4)
Four Point Four Five Percent Notes Due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	298.0		297.9
Debt Instrument, Face Amount	300.0		300.0
Debt Issuance Cost	$ (2.0)		$ (2.1)
4.45% Notes Due 2023
Debt Instrument [Line Items]
Maturity Year Of Debt Instrument	2023
Debt Instrument, Interest Rate, Stated Percentage	4.45%		4.45%
6.55% Notes Due 2036
Debt Instrument [Line Items]
Maturity Year Of Debt Instrument	2036
Debt Instrument, Interest Rate, Stated Percentage	6.55%		6.55%

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number of days to maturity from date of issue

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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