Summary of Short-Term Borrowings and Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Short-term borrowings
Commercial paper issuances	$ 445.0	$ 354.5
Various debt due to international banks	6.3	2.7
Total short-term borrowings	451.3	357.2
Long-term debt
Debt issuance costs, net	(7.7)	(8.1)
Fair value adjustment related to hedged fixed rate debt instrument	7.8	1.3
Net long-term debt	699.8	692.8
2.875% Senior notes due October 1, 2022
Long-term debt
Senior notes	400.0	400.0
Less: Discount	(0.2)	(0.3)
2.45% Senior notes due December 15, 2019
Long-term debt
Senior notes	300.0	300.0
Less: Discount	$ (0.1)	$ (0.1)

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Fair value as of the balance sheet date of all derivative liabilities designated as interest rate fair value hedging instruments.

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Carrying amount at the balance sheet date of borrowings from a bank, not elsewhere enumerated in the taxonomy, with a maturity within one year (or within one operating cycle if longer) from the date of borrowing.

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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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