Fair Value Measurements - Level 3 Significant Unobservable Inputs (Detail) $ in Millions	Dec. 31, 2019 USD ($) year	Dec. 31, 2018 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability	$ 1,694.6	$ 592.1
Swap | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability	$ 33.4	$ 32.8
Conversion Rate | Swap | Fair Value, Measurements, Recurring | LEVEL 3 | Lower Limit
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability, measurement input	1.62	1.62
Conversion Rate | Swap | Fair Value, Measurements, Recurring | LEVEL 3 | Upper Limit
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability, measurement input		1.64
Visa Class A Appreciation | Swap | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability, measurement input	0.0854
Visa Class A Appreciation | Swap | Fair Value, Measurements, Recurring | LEVEL 3 | Lower Limit
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability, measurement input		0.070
Visa Class A Appreciation | Swap | Fair Value, Measurements, Recurring | LEVEL 3 | Upper Limit
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability, measurement input		0.110
Expected Duration | Swap | Fair Value, Measurements, Recurring | LEVEL 3 | Lower Limit
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability, measurement input	1.0	1.5
Expected Duration | Swap | Fair Value, Measurements, Recurring | LEVEL 3 | Upper Limit
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability, measurement input	3.0	4.0