Financing (Components Of Debt) (Detail) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	5.00%
Long-term debt	$ 940.3	$ 942.3
Short-term Debt	$ 7.8	$ 6.9
Four Point Four Five Percent Notes Due Two Thousand And Twenty Three [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.45%	4.45%
Syndicated Loan Facility [Member]
Debt Instrument [Line Items]
Long-term debt	$ 71.9	$ 76.1
Short-term Debt	6.1	5.3
Six Point Five Five Percent Notes Due 2036 [Member]
Debt Instrument [Line Items]
Long-term debt	198.3	198.2
Four Point Four Five Percent Notes Due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 298.7	$ 298.6
6.55% Notes Due 2036
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.55%	6.55%
Senior Notes Due 2048 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 346.0	$ 345.9
Other Deferred Financing Costs [Member]
Debt Instrument [Line Items]
Long-term debt	1.4	1.6
Building Loan Facility [Member]
Debt Instrument [Line Items]
Long-term debt	26.8	25.1
Short-term Debt	$ 1.7	$ 1.6

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

No definition available.

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- Definition

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

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- Definition

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+ References

No definition available.

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- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(1))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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