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Short-Term Debt (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Short-Term Debt Credit Facilities

Credit Facilities

		December 31, 2016												December 31, 2015
										Letters												Letters
		Credit				Borrowings				of Credit				Credit				Borrowings				of Credit
(millions)		Facilities				Outstanding ⁽¹⁾				Outstanding				Facilities				Outstanding ⁽¹⁾				Outstanding
5-year facility ⁽²⁾		$	325.0			$	40.0			$	0.5			$	325.0			$	0.0			$	0.5
3-year accounts receivable facility ⁽³⁾			150.0				130.0				0.0				150.0				61.0				0.0
Total		$	475.0			$	170.0			$	0.5			$	475.0			$	61.0			$	0.5

(1)	Borrowings outstanding are reported as notes payable.

(2)	This 5-year facility matures December 17, 2018.

(3)	This 3-year facility matures March 23, 2018.