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Senior Notes, Carrying Value

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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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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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 of the required periodic payments applied to interest.

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Amount, after accumulated amortization, of debt discount.

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Fixed interest rate related to the interest rate derivative.

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Nominal or face amount used to calculate payment on derivative.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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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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Debt (Details Numeric 2) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
Debt (Details Numeric 2) - USD ($) $ in Millions	Feb. 28, 2010	Feb. 27, 2015	Nov. 29, 2019	Jun. 07, 2019	Jan. 21, 2015	Jun. 13, 2014
Notes 2020
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 900.0
2020 Notes, Interest Rate, Stated Percentage	4.75%
Proceeds from Issuance of Debt	$ 894.5
Debt Instrument, Unamortized Discount	5.5
Unamortized Debt Issuance Expense	$ 6.4
Debt Instrument, Interest Rate, Effective Percentage	4.92%
Senior Notes, Carrying Value			$ 899.6
Notes 2025
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 1,000.0
2020 Notes, Interest Rate, Stated Percentage					3.25%
Proceeds from Issuance of Debt		$ 989.3
Debt Instrument, Unamortized Discount					$ 10.7
Unamortized Debt Issuance Expense					$ 7.9
Debt Instrument, Interest Rate, Effective Percentage					3.67%
Notes 2020 and 2025
Debt Instrument [Line Items]
Senior Notes, Carrying Value			1,890.0
Senior Notes, Fair Value			1,960.0
Repurchase notes at price of their principal amount plus accrued and unpaid interest	101.00%
Debt Instrument, Periodic Payment, Interest			$ 75.3
Treasury Lock
Debt Instrument [Line Items]
Derivative, Notional Amount				$ 1,000.0
Interest Rate Swap
Debt Instrument [Line Items]
Derivative, Notional Amount						$ 900.0
Derivative, Fixed Interest Rate						4.75%