Share-Based Compensation - Compensation Awards (Details) - 2013 EIP and 2014 NEEIP - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Shares Subject To Outstanding Options
Balance at the beginning of period	3,063,169
Granted ( in shares)	960,850
Exercised (in shares)	(164,076)
Forfeited (in shares)	(909,471)
Balance at the end of period	2,950,472	3,063,169
Weighted-Average Exercise Price of Outstanding Options
Balance at the beginning of the period (in dollars per share)	$ 26.70
Granted (in dollars per share)	20.25
Exercised (in dollars per share)	19.15
Forfeited (in dollars per share)	27.57
Balance at the end of the period (in dollars per share)	$ 24.75	$ 26.70
Additional disclosures
Aggregate intrinsic value of options outstanding	$ 8.5	$ 5.1	$ 8.0
Aggregate intrinsic value of options exercisable	3.8
Total estimated fair value of options vested	$ 6.2	$ 8.4	$ 8.2

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of share options (or share units) exercised during the current period.

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