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Derivatives and Hedging Activities - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Mar. 31, 2019 USD ($) derivative | Mar. 31, 2018 USD ($) | Dec. 31, 2018 derivative | Jun. 30, 2015 EUR (€) | Mar. 31, 2015 USD ($)
4.50% Senior Notes due September 2023 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt interest rate |  | 4.50% |  |  |  |
Foreign currency forward contracts | Designated as Hedging Instruments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Maximum original maturity of foreign currency forward contracts |  | 12 months |  |  |  |
Unrealized (loss) gain on derivative instruments, net of taxes (less than in current QTD) |  | $ (1.2) | $ 1.1 |  |  |
Net unrealized derivative gains 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 |  | $ 1.1 |  |  |  |
Fair value of liability derivatives, after tax |  | $ 0.8 |  |  |  |
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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