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Derivatives and Hedging Activities - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2020 USD ($) derivative | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) derivative | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) derivative | Jun. 30, 2015 EUR (€) | Mar. 31, 2015 USD ($)
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] |  |  |  |  |  |  |  |
Fair value of (liability) derivative |  |  |  |  |  | $ (1.2) |  |
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 (loss) gain related to cash flow hedging activities |  | $ (2.4) | $ 0.9 | $ 0.4 | $ (0.4) |  |  |
Net unrealized derivative losses included in AOCI to be reclassified into earnings in next twelve months |  |  |  | $ (1.0) |  |  |  |
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 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) derivative |  | $ (19.8) |  | $ (19.8) |  |  |  |
Fair value of liability derivatives net after tax |  | $ (14.9) |  | $ (14.9) |  |  |  |
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) derivative | $ (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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