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Derivatives and Hedging Activities - Narrative (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) derivative | Dec. 31, 2018 USD ($) derivative | Dec. 31, 2017 USD ($) | Jun. 30, 2015 EUR (€) | Mar. 31, 2015 USD ($)
4.50% Senior Notes due September 2023 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Debt interest rate | 4.50% |  |  |  |
Foreign Currency Forward Contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value of (liability) derivatives | $ (1.2) | $ 0.6 |  |  |
Foreign Currency Forward Contracts | Designated as Hedging Instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unrealized gain (losses) on derivative instruments, net of taxes | (2.8) | $ 2.9 | $ (5.0) |  |
Estimate of net unrealized gains that will be reclassified into earnings in next twelve months | $ (1.4) |  |  |  |
Foreign Currency Forward Contracts | Not Designated as Hedging Instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Maximum original maturity period 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 | € |  |  |  | € 400,000,000.0 |
Debt interest rate |  |  |  | 4.50% |
EUR - Denominated debt | Designated as Hedging Instruments | Net Investment Hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value of (liability) derivatives | $ 2.0 |  |  |  |
Fair value of (liability) derivatives, after tax | $ 1.5 |  |  |  |
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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