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Stock-based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock-based Compensation
Shares available for grant	2,000
Restricted Stock Units
No. of Stock Units
Nonvested restricted stock units, beginning of period	782
Granted (in units)	221
Vested (in units)	(274)
Forfeited (in units)	(39)
Nonvested restricted stock units, end of period	690	782
Weighted Average Grant Date Fair Value
Nonvested restricted stock units, beginning of period	$ 19.84
Granted (in dollars per share)	37.04
Vested (in dollars per share)	19.50
Forfeited (in dollars per share)	22.48
Nonvested restricted stock units, end of period	$ 25.34	$ 19.84
Stock-based Compensation
Vesting period	3 years
Unrecognized compensation cost	$ 11.1
Weighted average period over which unrecognized compensation cost is expected to be recognized	2 years
Selling, General and Administrative Expenses
Stock-based Compensation
Share-based compensation costs recognized	$ 7.0	$ 4.7	$ 0.0

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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