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Derivatives and Hedging Activities - Narrative (Details) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) derivative | Mar. 31, 2017 USD ($) | Dec. 31, 2017 derivative | Jun. 30, 2015 EUR (€) | Mar. 31, 2015 USD ($)
Derivative [Line Items] |  |  |  |  |
Net unrealized after-tax losses related to contracts included in AOCI | $ 9.9 | $ 9.6 |  |  |
4.50% Senior Notes due September 2023 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Debt interest rate | 4.50% |  |  |  |
Foreign currency forward contracts | Net Investment Hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of outstanding derivative | € |  |  |  | € 270,000,000 |
Cumulative translation adjustment loss before tax | $ 3.5 |  |  |  |
Cumulative translation adjustment loss, after tax | $ 2.2 |  |  |  |
Foreign currency forward contracts | Designated as Hedging Instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Maximum original maturity of foreign currency forward contracts | 12 months |  |  |  |
Net unrealized after-tax losses related to contracts included in AOCI | $ (1.1) | $ 2.9 |  |  |
Net unrealized derivative losses included in AOCI to be reclassified into earnings in next twelve months | $ (0.3) |  |  |  |
Foreign currency forward contracts | Derivatives not designated as hedging instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Maximum original maturity of foreign currency forward contracts | 12 months |  |  |  |
Interest rate swaps |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of derivative instruments outstanding | derivative | 0 |  | 0 |  |
EUR - Denominated debt | Net Investment Hedge | 4.50% Senior Notes due September 2023 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Debt instrument face amount | € |  |  |  | € 400,000,000 |
Debt interest rate |  |  |  | 4.50% |
EUR - Denominated debt | Designated as Hedging Instruments | Net Investment Hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value of liability derivatives | $ 42.1 |  |  |  |
Fair value of liability derivatives, after tax | 27.9 |  |  |  |
Cross-currency swaps | Net Investment Hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of outstanding derivative |  |  |  |  | $ 425.0
Cross-currency swaps | Designated as Hedging Instruments | Net Investment Hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value of liability derivatives | 61.9 |  |  |  |
Semi-annual interest settlement resulted in AOCI | 17.7 |  |  |  |
Semi-annual interest settlement resulted in AOCI after tax | $ (44.2) |  |  |  |

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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32022-110900 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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