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Debt (Detail) $ in Millions		Dec. 31, 2017 USD ($) instrument	Dec. 31, 2016 USD ($) instrument
Debt Instrument [Line Items]
Fair Value		$ 3,643.6	$ 3,315.8
Debt, Long-term and Short-term, Combined Amount	[1]	3,306.3	3,148.2
3.75% Senior Notes due 2021
Debt Instrument [Line Items]
Carrying Value		498.8	498.4
Fair Value		520.7	528.8
2.45% Senior Notes Due 2027
Debt Instrument [Line Items]
Carrying Value		496.1	495.8
Fair Value		477.9	464.6
6 5/8% Senior Notes due 2029
Debt Instrument [Line Items]
Carrying Value		296.1	295.9
Fair Value		382.3	380.1
6.25% Senior Notes due 2032
Debt Instrument [Line Items]
Carrying Value		395.3	395.2
Fair Value		516.9	499.0
4.35% Senior Notes due 2044
Debt Instrument [Line Items]
Carrying Value		346.5	346.4
Fair Value		388.7	362.3
3.70% Senior Notes due 2045
Debt Instrument [Line Items]
Carrying Value		395.2	395.1
Fair Value		402.9	372.5
4.125% Senior Notes due 2047
Debt Instrument [Line Items]
Carrying Value		841.2	0.0
Fair Value		917.1	0.0
6.70% Fixed-to-Floating Rate Junior Subordinated Debentures due 2067
Debt Instrument [Line Items]
Carrying Value		0.0	594.1
Fair Value		0.0	581.2
Other Debt Instruments [Member]
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount		$ 37.1	$ 127.3
Notes Payable, Other Payables [Member] | Other Debt Instruments [Member]
Debt Instrument [Line Items]
Debt Instrument, Number of Debt Instruments Acquired | instrument		2	2
Debt, Long-term and Short-term, Combined Amount		$ 37.1	$ 62.1
Trust Preferred Debt Securities [Member] | Other Debt Instruments [Member]
Debt Instrument [Line Items]
Carrying Value		$ 0.0	$ 41.2
Debt Instrument, Number of Debt Instruments Acquired | instrument		0	2
Senior Notes [Member] | Other Debt Instruments [Member]
Debt Instrument [Line Items]
Carrying Value		$ 0.0	$ 24.0
Debt Instrument, Number of Debt Instruments Acquired | instrument		0	4
[1] Consists of both short-term and long-term debt. See Note 4 – Debt for further discussion.

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Debt Instrument, Number of Debt Instruments Acquired

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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