Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Taxes [Line Items]
Due to related party	$ 14.3		$ 0.0
Unrecognized tax benefits	28.7
Unrecognized tax benefits which, if recognized, would impact the company's effective tax rate	22.7
Unrecognized tax benefits netted with deferred tax asset carryforwards	25.8
Accrued interest	$ 1.1
Effective tax rate	16.70%	27.90%
Federal and state combined statutory tax rate	26.10%	39.30%
AEPC
Income Taxes [Line Items]
Due to related party	$ 14.3

Effective Income Tax Rate Reconciliation, at Combined Federal Statutory and State Income Tax Rate, Percent

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- Definition

Unrecognized Tax Benefits, State Tax Credits

+ References

No definition available.

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of unrecognized tax benefits.

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Amount of interest expense accrued for an underpayment of income taxes.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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