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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative assets $ 35.4   $ 20.5
Fair Value Hedging      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Remaining cumulative basis adjustments on discontinued hedge relationship $ 0.3   $ (0.4)
Cash Flow Hedging      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Maximum length of future cash flow hedges 7 years 3 months 18 days    
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 $ 5.8    
Reclassification from AOCI 0.1  
Net Investment Hedging      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative notional amount outstanding 360.7    
Pre-tax gain recognized in OCI 13.2    
Interest-Rate Contracts      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional amount of outstanding contracts 3,648.6    
Notional maturities for interest-rate contracts, remainder of 2021 880.8    
Notional maturities for interest-rate contracts 2022 941.4    
Notional maturities for interest-rate contracts 2023 744.6    
Notional maturities for interest-rate contracts 2024 334.9    
Notional maturities for interest-rate contracts 2025 224.3    
Notional maturities for interest-rate contracts 2026 441.5    
Notional maturities for interest-rate contracts thereafter 81.1    
Foreign-exchange contracts      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative notional amount outstanding $ 1,429.2    
Foreign-exchange contracts maturity period within one year