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Debt - Narrative (Details)
$ in Millions
1 Months Ended 6 Months Ended
Jun. 22, 2020
USD ($)
Oct. 31, 2017
USD ($)
Jun. 30, 2022
USD ($)
facility
quarterly_payment
Debt Instrument [Line Items]      
Number of quarterly installment payments at 0.625% | quarterly_payment     8
Senior Secured Credit Facility - Amended III      
Debt Instrument [Line Items]      
Commitment Fee     0.23%
Letter of Credit | Three Committed Letter of Credit Facilities      
Debt Instrument [Line Items]      
Available capacity amount     $ 31
Number of term loan facilities | facility     3
Amount available     $ 71
Undrawn letters of credit     40
Letter of Credit | Fifteen Million Committed Facility      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity     15
Letter of Credit | Thirty Two Million Committed Facility      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity     32
Letter of Credit | Twenty-four Million Committed Facility      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity     24
Letter of Credit | Three Unsecured Letter of Credit Facilities      
Debt Instrument [Line Items]      
Available capacity amount     $ 42
Number of term loan facilities | facility     3
Amount available     $ 65
Undrawn letters of credit     23
Letter of Credit | Forty Million Unsecured Letter Of Credit Facility      
Debt Instrument [Line Items]      
Amount available     40
Letter of Credit | Fifteen Million Unsecured Letter Of Credit Facility      
Debt Instrument [Line Items]      
Amount available     15
Letter of Credit | Ten Million Unsecured Letter Of Credit Facility      
Debt Instrument [Line Items]      
Amount available     $ 10
Minimum | Senior Secured Credit Facility - Amended III      
Debt Instrument [Line Items]      
Commitment Fee     0.15%
Maximum | Senior Secured Credit Facility - Amended III      
Debt Instrument [Line Items]      
Commitment Fee     0.28%
Term Loan A | Senior Secured Credit Facility - Amended III      
Debt Instrument [Line Items]      
Debt, aggregate principal amount     $ 1,400
First two years quarterly principal payment, percentage     0.625%
Post two years quarterly principal payment, percentage     1.25%
Revolving Credit Facility | Senior Secured Credit Facility - Amended III      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity     $ 1,000
Available capacity amount     $ 510
Senior unsecured notes | Four hundred million senior unsecured notes      
Debt Instrument [Line Items]      
Debt, aggregate principal amount $ 400    
Debt maturity period 5 years    
Interest Rate Percentage 5.50%    
Senior unsecured notes | Six hundred million senior unsecured notes      
Debt Instrument [Line Items]      
Debt, aggregate principal amount   $ 600  
Debt maturity period   10 years  
Interest Rate Percentage   4.625%  
SOFR | Senior Secured Credit Facility - Amended III      
Debt Instrument [Line Items]      
Interest rate margin     1.50%
SOFR | Senior Secured Credit Facility - Amended III | Minimum      
Debt Instrument [Line Items]      
Interest rate margin     1.25%
SOFR | Senior Secured Credit Facility - Amended III | Maximum      
Debt Instrument [Line Items]      
Interest rate margin     1.75%
Base Rate | Senior Secured Credit Facility - Amended III      
Debt Instrument [Line Items]      
Interest rate margin     0.50%
Base Rate | Senior Secured Credit Facility - Amended III | Minimum      
Debt Instrument [Line Items]      
Interest rate margin     0.25%
Base Rate | Senior Secured Credit Facility - Amended III | Maximum      
Debt Instrument [Line Items]      
Interest rate margin     0.75%