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Other Income, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
AFUDC - Equity	$ 15.2	$ 11.4	$ 25.1
Non-service credit (cost) components of net periodic benefit costs	26.0	9.1	(14.2)
Gain on repurchase of notes	0.0	0.0	23.6
Other, net	29.1	53.2	32.1
Other income, net	$ 70.3	$ 73.7	$ 66.6

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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-Paragraph 4
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- Definition

Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 3A
-Subparagraph (b)
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- Definition

Amount of income (expense) related to nonoperating activities, classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of other income related to a regulated utility accounting practice whereby the cost of equity funds used to finance construction are credited on the statements of income and charged to construction in progress on the balance sheet.

+ References

No definition available.

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- Definition

Amount of unclassified other income (expense) related to nonoperating activities.

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