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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value Hedging      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Remaining cumulative basis adjustments on discontinued hedge relationship $ (0.4) $ (1.5)  
Cash Flow Hedging      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Maximum length of future cash flow hedges 7 years 6 months    
Accumulated net loss on derivative contracts included in accumulated other comprehensive loss expected to be recognized in the Consolidated Statements of Comprehensive Income in the following 12 months, net of tax $ 15.0    
Reclassification from AOCI
Net Investment Hedging      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative notional amount outstanding 344.8    
Pre-tax loss recognized in OCI 20.4    
Interest-Rate Contracts      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional amount of outstanding contracts 3,280.5    
Notional maturities for interest-rate contracts 2021 1,241.1    
Notional maturities for interest-rate contracts 2022 950.0    
Notional maturities for interest-rate contracts 2023 761.8    
Notional maturities for interest-rate contracts 2024 169.6    
Notional maturities for interest-rate contracts 2025 58.9    
Notional maturities for interest-rate contracts thereafter 99.1    
Foreign-exchange contracts      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative notional amount outstanding $ 1,128.8    
Foreign-exchange contracts maturity period within one year