Share-Based Compensation - Compensation Awards (Details) - 2013 EIP and 2014 NEEIP - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Number of Shares Subject To Outstanding Options
Balance at the beginning of period	2,508,569	2,230,795	2,311,164
Granted ( in shares)	755,800	720,350	474,675
Exercised (in shares)	(74,692)	(275,776)	(197,328)
Forfeited (in shares)	(126,508)	(166,800)	(357,716)
Balance at the end of period	3,063,169	2,508,569	2,230,795
Weighted-Average Exercise Price of Outstanding Options
Balance at the beginning of the period (in dollars per share)	$ 26.40	$ 23.88	$ 23.07
Granted (in dollars per share)	27.10	32.60	24.06
Exercised (in dollars per share)	18.65	22.61	22.18
Forfeited (in dollars per share)	27.95	25.70	19.83
Balance at the end of the period (in dollars per share)	$ 26.70	$ 26.40	$ 23.88
Additional disclosures
Aggregate intrinsic value of options outstanding	$ 5.1	$ 8.0	$ 18.1
Aggregate intrinsic value of options exercisable	3.9
Total estimated fair value of options vested	$ 8.4	$ 8.2	$ 7.7

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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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