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Debt - Debt and Average Interest Rates on Debt Outstanding (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs and discounts | $ (10.6) | $ (5.1)
Total debt | $ 1,215.1 | 787.6
Commercial Paper |  |
Debt Instrument [Line Items] |  |
Average interest rate as of June 30, 2019 | 2.943% |
Commercial paper | $ 130.9 | 76.0
Line of Credit | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Average interest rate as of June 30, 2019 | 3.498% |
Total debt | $ 4.1 | 26.2
Senior Notes | Senior Notes 2.650% Due 2019 |  |
Debt Instrument [Line Items] |  |
Average interest rate as of June 30, 2019 | 2.65% |
Total debt | $ 250.0 | 250.0
Senior Notes | Senior Notes 2.45% Due 2019 |  |
Debt Instrument [Line Items] |  |
Average interest rate as of June 30, 2019 | 2.45% |
Total debt | $ 155.3 | 155.1
Senior Notes | Senior Notes 3.625% Due 2020 |  |
Debt Instrument [Line Items] |  |
Average interest rate as of June 30, 2019 | 3.625% |
Total debt | $ 74.0 | 74.0
Senior Notes | Senior Notes 5.000% Due 2021 |  |
Debt Instrument [Line Items] |  |
Average interest rate as of June 30, 2019 | 5.00% |
Total debt | $ 103.8 | 103.8
Senior Notes | Senior Notes 3.150% Due 2022 |  |
Debt Instrument [Line Items] |  |
Average interest rate as of June 30, 2019 | 3.15% |
Total debt | $ 88.3 | 88.3
Senior Notes | Senior Notes 4.650% Due 2025 |  |
Debt Instrument [Line Items] |  |
Average interest rate as of June 30, 2019 | 4.65% |
Total debt | $ 19.3 | 19.3
Senior Notes | Senior Notes 4.500% Due 2029 |  |
Debt Instrument [Line Items] |  |
Average interest rate as of June 30, 2019 | 4.50% |
Total debt | $ 400.0 | $ 0.0

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: 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)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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