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Derivatives and Hedging Activities - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) derivative | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) derivative | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) derivative | Sep. 30, 2015 EUR (€)
4.50% Senior Notes due September 2023 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt interest rate | 4.50% |  | 4.50% |  |  |
Foreign currency forward and option contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Decrease in translated value | $ (4.3) |  | $ (4.3) |  | $ (0.3) |
Foreign currency forward and option contracts | Designated as hedging instruments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Maximum original maturity of foreign currency forward contracts |  |  | 12 months |  |  |
Net unrealized gain (loss) related to cash flow hedging activities | $ 2.0 | $ (2.4) | $ 5.4 | $ 0.4 |  |
Estimate of net unrealized derivative losses included in AOCI to be reclassified into earnings in next twelve months |  |  | $ 2.4 |  |  |
Foreign currency forward and option 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 |  | 0 |
EUR - Denominated debt | Net investment hedge | 4.50% Senior Notes due September 2023 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt instrument aggregate principal | € |  |  |  |  |  | € 400,000,000
Debt interest rate |  |  |  |  |  | 4.50%
EUR - Denominated debt | Designated as hedging instruments | Net investment hedge |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Decrease in translated value | $ 14.0 |  | $ 14.0 |  |  |
Decrease in translated value net after tax | $ 10.5 |  | $ 10.5 |  |  |

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