Debt Issuance Costs [Roll Forward]

No definition available.

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- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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-Publisher FASB
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-Section S99
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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

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-SubTopic 50
-Section 40
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-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
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Debt (Schedule of Debt Issuance Costs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Debt Issuance Costs [Roll Forward]
Balance at December 31, 2016			$ 11.3
Debt issuance costs from February 10, 2017 debt financing arrangement			4.7	$ 0.1
Loss on debt extinguishment from April 28, 2014 debt financing arrangement	$ 0.0	$ 0.0	(2.6)	$ 14.1
Amortization of debt issuance costs			(2.4)
Balance at September 30, 2017	$ 11.0		11.0
Financing Arrangement, February 2017 [Member]
Debt Issuance Costs [Roll Forward]
Debt issuance costs from February 10, 2017 debt financing arrangement			3.2
Financing Agreement, April 2014 [Member]
Debt Issuance Costs [Roll Forward]
Loss on debt extinguishment from April 28, 2014 debt financing arrangement			$ (1.1)