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Stock-Based Compensation - Summary of Restricted Stock Grants and PSUs (Details) shares in Millions	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Restricted Stock
Number of Restricted Shares
Outstanding and non-vested, at December 31, 2019	0.2
Granted	0.1
Vested	(0.1)
Forfeited	0.0
Outstanding and non-vested, at December 31, 2020	0.2
Weighted Average Price per Share
Outstanding and non-vested, at December 31, 2019 | $ / shares	$ 22.53
Granted | $ / shares	27.85
Vested | $ / shares	18.40
Forfeited | $ / shares	25.96
Outstanding and non-vested, at December 31, 2020 | $ / shares	$ 26.18
PSUs
Number of Restricted Shares
Outstanding and non-vested, at December 31, 2019	0.3
Granted	0.2	[1]
Vested	(0.3)
Forfeited	0.0
Outstanding and non-vested, at December 31, 2020	0.2
Weighted Average Price per Share
Outstanding and non-vested, at December 31, 2019 | $ / shares	$ 24.37
Granted | $ / shares	25.83	[1]
Vested | $ / shares	22.45
Forfeited | $ / shares	26.09
Outstanding and non-vested, at December 31, 2020 | $ / shares	$ 27.60
Performance-based Restricted Stock Units, 2017 Grants | PSUs
Number of Restricted Shares
Granted	0.1	[1]
[1] Includes 0.1 million PSUs, representing the effect of the PSUs granted in 2018 being earned at 156% of target. The PSUs granted in 2018 vested on December 31, 2020.

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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