Debt Instrument, Covenant, Fixed Rate Coverage Ratio, Minimum

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Debt Instrument, Covenant, Leverage Ratio, Minimum

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Line Of Credit Facility, Percentage Of Quarterly Installment Payments

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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Average amount borrowed under the credit facility during the period.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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The effective interest rate at the end of the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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LONG-TERM DEBT AND LINES OF CREDIT - Narrative (Details)		3 Months Ended		6 Months Ended		12 Months Ended	50 Months Ended
	May 15, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2021	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Amortization of discounts, premiums, and deferred debt issuance costs		$ 3,000,000.0	$ 3,100,000	$ 5,900,000	$ 6,100,000
Proceeds from long-term debt				1,867,008,000	586,000,000
Long-term debt		9,273,601,000		9,273,601,000		$ 9,125,501,000
Interest expense		81,100,000	$ 65,500,000	162,200,000	$ 123,900,000
Interest rate swap
Debt Instrument [Line Items]
Accumulated other comprehensive income (loss) related to interest rate		42,400,000		42,400,000
Line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity		508,500,000		508,500,000
Remaining borrowing capacity		1,124,600,000		1,124,600,000
Net repayments of settlement lines of credit				62,100,000		74,500,000
Amount outstanding under lines of credit		439,500,000		$ 439,500,000		$ 463,200,000
Average outstanding balance		$ 282,900,000
Weighted-average interest rate of short-term debt (as a percent)		2.11%		2.11%		3.16%
Fourth Amendment \| Revolving Credit Facility
Debt Instrument [Line Items]
Minimum leverage ratio		3.50		3.50
Minimum interest coverage ratio		3.00		3.00
Fourth Amendment \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Commitment fee rate (as a percent)				0.125%
Fourth Amendment \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Commitment fee rate (as a percent)				0.30%
Senior Notes and Term Loans
Debt Instrument [Line Items]
Unamortized debt issuance costs		$ 51,400,000		$ 51,400,000
Senior Notes
Debt Instrument [Line Items]
Unamortized discount		8,900,000		8,900,000
Long-term debt		7,100,000,000		7,100,000,000
Fair value of debt instrument		7,700,000,000		7,700,000,000
Senior Notes \| TSYS
Debt Instrument [Line Items]
Amortization of discounts, premiums, and deferred debt issuance costs		9,000,000.0		18,100,000
Senior Notes \| Senior Unsecured Notes
Debt Instrument [Line Items]
Face amount of debt instrument		$ 7,100,000,000		$ 7,100,000,000
Senior Notes \| 3.800% senior notes due April 1, 2021
Debt Instrument [Line Items]
Stated interest rate (as a percent)		3.80%		3.80%
Senior Notes \| 3.750% senior notes due June 1, 2023
Debt Instrument [Line Items]
Stated interest rate (as a percent)		3.75%		3.75%
Senior Notes \| 4.000% senior notes due June 1, 2023
Debt Instrument [Line Items]
Stated interest rate (as a percent)		4.00%		4.00%
Senior Notes \| 2.650% senior notes due February 15, 2025
Debt Instrument [Line Items]
Stated interest rate (as a percent)		2.65%		2.65%
Senior Notes \| 4.800% senior notes due April 1, 2026
Debt Instrument [Line Items]
Stated interest rate (as a percent)		4.80%		4.80%
Senior Notes \| 4.450% senior notes due June 1, 2028
Debt Instrument [Line Items]
Stated interest rate (as a percent)		4.45%		4.45%
Senior Notes \| 3.200% senior notes due August 15, 2029
Debt Instrument [Line Items]
Stated interest rate (as a percent)		3.20%		3.20%
Senior Notes \| 4.150% senior notes due August 15, 2049
Debt Instrument [Line Items]
Stated interest rate (as a percent)		4.15%		4.15%
Senior Notes \| 2.900% senior notes due May 15, 2030
Debt Instrument [Line Items]
Face amount of debt instrument	$ 1,000,000,000.0
Stated interest rate (as a percent)	2.90%	2.90%		2.90%
Proceeds from long-term debt	$ 996,700,000
Debt issuance costs	$ 8,400,000
Term Loans
Debt Instrument [Line Items]
Unamortized debt issuance costs						$ 46,600,000
Term Loans \| Term Loan A \| Forecast
Debt Instrument [Line Items]
Rate of quarterly installment payments (as a percent)							2.50%
Unsecured Debt \| Term Loan Facility
Debt Instrument [Line Items]
Effective interest rate (as a percent)		1.55%		1.55%
Unsecured Debt \| Unsecured revolving credit facility
Debt Instrument [Line Items]
Unamortized debt issuance costs		$ 15,300,000		$ 15,300,000
Unsecured Debt \| Five Year Senior Unsecured Credit Facility \| Term Loan Facility \| Federal Funds Effective Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.50%
Unsecured Debt \| Five Year Senior Unsecured Credit Facility \| Term Loan Facility \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.00%
Unsecured Debt \| Five Year Senior Unsecured Credit Facility \| Forecast \| Term Loan Facility
Debt Instrument [Line Items]
Face amount of debt instrument								$ 2,000,000,000
Unsecured Debt \| Five Year Senior Unsecured Credit Facility \| Forecast \| Revolving Credit Facility
Debt Instrument [Line Items]
Face amount of debt instrument								$ 3,000,000,000
Line of credit
Debt Instrument [Line Items]
Unamortized debt issuance costs						$ 17,600,000
Line of credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Remaining borrowing capacity		2,300,000,000		$ 2,300,000,000
Outstanding borrowings under the credit facility		0		0
Line of credit \| Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 250,000,000		$ 250,000,000