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Derivative Instruments and Hedging Activities (Notional Values and After-Tax Impact of Changes in Fair Value) (Details) - Designated as Hedging Instrument € in Millions, $ in Millions | 3 Months Ended |  |  |
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Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Jan. 31, 2018 USD ($) | Dec. 31, 2015 EUR (€)
Cross currency swap contract | Net Investment Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | $ 300.0 |  | $ 300.0 | $ 300.0 |
Gain (loss) on derivative used in net investment hedge, net of tax | 6.9 | $ (4.6) |  |  |
Revolving Credit Facility | Net Investment Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | 179.8 |  | 0.0 |  | € 160.0
Foreign Exchange Contract | Net Investment Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (loss) on derivative used in net investment hedge, net of tax | 1.7 | $ (10.4) |  |  |
Foreign Exchange Contract | Cash Flow Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | $ 205.8 |  | $ 127.0 |  |

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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 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=114867106&loc=SL7669646-108580 + Details
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