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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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- Definition 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 + Details
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- Definition The fair value amount of long-term debt 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. + References No definition available. + Details
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