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Stock-Based Compensation - Summary of Restricted Stock Grants and PSUs (Details) shares in Millions	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Restricted Stock
Number of Restricted Shares
Outstanding and non-vested, at December 31, 2018 (shares)	0.2
Granted (shares)	0.1
Vested (shares)	(0.1)
Forfeited (shares)	0.0
Outstanding and non-vested, at December 31, 2019 (shares)	0.2
Weighted Average Price per Share
Outstanding and non-vested, at December 31, 2018 (usd per share) | $ / shares	$ 18.12
Granted (usd per share) | $ / shares	27.51
Vested (usd per share) | $ / shares	14.72
Forfeited (usd per share) | $ / shares	18.96
Outstanding and non-vested, at December 31, 2019 (usd per share) | $ / shares	$ 22.53
PSUs
Number of Restricted Shares
Outstanding and non-vested, at December 31, 2018 (shares)	0.3
Granted (shares)	0.2	[1]
Vested (shares)	(0.2)
Forfeited (shares)	0.0
Outstanding and non-vested, at December 31, 2019 (shares)	0.3
Weighted Average Price per Share
Outstanding and non-vested, at December 31, 2018 (usd per share) | $ / shares	$ 20.13
Granted (usd per share) | $ / shares	22.23	[1]
Vested (usd per share) | $ / shares	17.04
Forfeited (usd per share) | $ / shares	17.85
Outstanding and non-vested, at December 31, 2019 (usd per share) | $ / shares	$ 24.37
Performance-based Restricted Stock Units, 2017 Grants | PSUs
Number of Restricted Shares
Granted (shares)	0.1	[1]
[1] Includes 0.1 million PSUs, representing the effect of the PSUs granted in 2017 being earned at 200% of target. The PSUs granted in 2017 vested on December 31, 2019.

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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