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Derivative Financial Instruments and Fair Value Measurements - Additional Information (Details)
€ in Millions, £ in Millions, $ in Millions
1 Months Ended
Sep. 30, 2021
GBP (£)
Sep. 30, 2021
EUR (€)
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Forecasted IT contract payment | £ £ 6.0        
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value measured on a recurring basis          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Deferred compensation plan assets     $ 130.9 $ 119.4  
Euro-denominated notes | Estimate of fair value measurement | Significant Other Observable Inputs (Level 2)          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying value of long-term debt     1,090.0 1,159.1  
Euro-denominated notes | Carrying value | Significant Other Observable Inputs (Level 2)          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying value of long-term debt     $ 1,038.4 $ 1,094.5  
Cross-currency swap | Cash flow hedge          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term debt   € 202.3     $ 55.4
Fixed annual interest rate   1.256% 1.256%   1.143%
Designated as hedging instrument | Notes due September 2022 | Euro-denominated notes          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term debt   € 400.0 $ 462.8    
Designated as hedging instrument | Notes Due June 2026 | Euro-denominated notes          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term debt   € 500.0 $ 575.6