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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net assets associated with foreign currency derivatives | $ (7.9) |  | $ (7.9) |  | $ (10.7)
Maturity period of derivatives (in months) |  |  | 18 months |  |
Estimated amount of net gains (losses) associated with derivative instruments, net of tax, in next twelve months |  |  | $ (5.0) |  |
Designated as Hedging Instrument | Foreign Exchange Forward | Cash Flow Hedges |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, notional amount | 212.6 |  | 212.6 |  |
Designated as Hedging Instrument | United Kingdom, Pounds | Foreign Exchange Forward | Cash Flow Hedges |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, notional amount | 116.7 |  | 116.7 |  |
Designated as Hedging Instrument | Australia, Dollars | Foreign Exchange Forward | Cash Flow Hedges |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, notional amount | 44.6 |  | 44.6 |  |
Designated as Hedging Instrument | Euro Member Countries, Euro | Foreign Exchange Forward | Cash Flow Hedges |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, notional amount | 18.2 |  | 18.2 |  |
Designated as Hedging Instrument | Singapore, Dollars | Foreign Exchange Forward | Cash Flow Hedges |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, notional amount | 9.5 |  | 9.5 |  |
Designated as Hedging Instrument | Norway, Krone | Foreign Exchange Forward | Cash Flow Hedges |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, notional amount | 16.5 |  | 16.5 |  |
Designated as Hedging Instrument | Brazil, Brazil Real | Foreign Exchange Forward | Cash Flow Hedges |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, notional amount | 7.1 |  | 7.1 |  |
Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net gains (losses) on derivatives not designated as hedging instruments | (2.3) | $ 2.2 | (7.6) | $ 9.7 |
Not Designated as Hedging Instrument | Foreign Exchange Forward | Fair Value Hedging |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, notional amount | 27.1 |  | 27.1 |  |
Not Designated as Hedging Instrument | United Kingdom, Pounds | Foreign Exchange Forward | Fair Value Hedging |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, notional amount | 7.8 |  | 7.8 |  |
Not Designated as Hedging Instrument | Nigeria, Nairas | Foreign Exchange Forward | Fair Value Hedging |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, notional amount | 9.6 |  | 9.6 |  |
Not Designated as Hedging Instrument | Israel, New Shekels | Foreign Exchange Forward | Fair Value Hedging |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, notional amount | 6.6 |  | 6.6 |  |
Not Designated as Hedging Instrument | Mexico, Pesos | Foreign Exchange Forward | Fair Value Hedging |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, notional amount | $ 3.1 |  | $ 3.1 |  |

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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 of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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