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Equity-Method Investments - Equity-method Investment Recorded in Consolidated Statements of Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Tax benefits and credits generated	$ (33.0)	$ 2.8	$ (10.1)
NMTC Program
Schedule of Equity Method Investments [Line Items]
Asset impairments to write investment down to fair value	0.0	0.0	14.0
Our portion of the partnership’s operating losses	0.0	0.0	8.3
Non-cash interest expense related to the amortization of the discounted fair value of future equity contributions	0.0	0.0	0.2
Tax benefits and credits generated	$ 0.0	$ 0.0	$ 28.5

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- Definition

Represents the non-cash interest expense related to the amortization of the discounted fair value of future equity contributions.

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Amount of deferred income tax expense (benefit) and income tax credits.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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