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Derivatives and Financial Instruments - Additional Information (Detail) $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2019 EUR (€) | Sep. 30, 2015 EUR (€)
Derivative [Line Items] |  |  |  |  |
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax |  | $ 1.0 | $ 0.8 |  |
Foreign Exchange Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  | 53.7 | 47.6 |  |
Currency Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  | 625.3 | 283.8 |  |
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax |  | $ 13.9 | $ 14.5 |  |
Senior Notes 2.45% Due 2019 | Senior Notes |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of hedged item | € |  |  |  | € 136,600,000 | € 500,000,000
Interest rate |  |  |  |  | 2.45%
Tender Offer | $ 363.4 |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -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 Amount, after tax, of reclassification from accumulated other comprehensive income (AOCI) of gain (loss) from increase (decrease) in fair value of net investment hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CCC -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998896-113959 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 + Details
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