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Derivative Financial Instruments and Fair Value Measurements - Additional Information (Details) $ in Millions | Sep. 30, 2019 USD ($) | Sep. 30, 2019 EUR (€) | Apr. 30, 2019 EUR (€) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair value of long-term debt | $ 1,045.7 |  |  | $ 1,053.0
Level 1 Inputs | Fair value measured on a recurring basis |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Deferred compensation plan assets | 101.4 |  |  | 89.5
Euro-denominated notes | Fair value | Level 2 Inputs |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair value of long-term debt | 1,045.7 |  |  | 1,052.9
Euro-denominated notes | Carrying value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying value of long-term debt | $ 974.3 |  |  | $ 1,024.6
Cross-currency swap | Cash flow hedge |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Long-term debt | € |  | € 55,400,000 | € 202,300,000 |
Fixed annual interest rate | 1.143% | 1.143% | 1.256% |
Designated as hedging instrument | Notes due September 2022 | Euro-denominated notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Long-term debt | $ 434.4 | € 400,000,000.0 |  |
Designated as hedging instrument | Notes Due June 2026 | Euro-denominated notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Long-term debt | $ 539.9 | € 500,000,000.0 |  |

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