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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative assets $ 213.9   $ 56.3
Fair Value Hedging      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Remaining cumulative basis adjustments on discontinued hedge relationship $ (1.2)   $ (1.5)
Cash Flow Hedging      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Maximum length of future cash flow hedges 8 years 3 months 18 days    
Accumulated net gain 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 $ 46.1    
Reclassification from AOCI  
Net Investment Hedging      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative notional amount outstanding 344.6    
Pre-tax gain recognized in OCI 15.0    
Interest-Rate Contracts      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional amount of outstanding contracts 3,006.3    
Notional maturities for interest-rate contracts, remainder of 2020 442.2    
Notional maturities for interest-rate contracts 2021 1,137.7    
Notional maturities for interest-rate contracts 2022 853.7    
Notional maturities for interest-rate contracts 2023 330.1    
Notional maturities for interest-rate contracts 2024 147.4    
Notional maturities for interest-rate contracts 2025 14.1    
Notional maturities for interest-rate contracts thereafter 81.1    
Foreign-exchange contracts      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative notional amount outstanding $ 1,144.7    
Foreign-exchange contracts maturity period within one year