Summary of Short-Term Borrowings and Long-Term Debt (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2017	Dec. 31, 2016
Short-term borrowings
Commercial paper issuances	$ 627.2	$ 420.0
Various debt due to international banks	2.1	6.8
Total short-term borrowings	629.3	426.8
Long-term debt
Debt issuance costs, net	(5.6)	(6.5)
Fair value adjustment asset (liability) related to hedged fixed rate debt instrument	0.0	0.2
Net long-term debt	894.1	693.4
2.875% Senior notes due October 1, 2022
Long-term debt
Senior notes	400.0	400.0
Less: Discount	(0.2)	(0.2)
2.45% Senior notes due December 15, 2019
Long-term debt
Senior notes	300.0	300.0
Less: Discount	(0.1)	(0.1)
Variable term loan due September 27, 2018
Long-term debt
Variable term loan due September 27, 2018	$ 200.0	$ 0.0

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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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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