Common Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		12 Months Ended
	Nov. 30, 2020	Oct. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Sale of equity shares (in shares)	3,000,000	20,000,000
Common stock, price (in dollars per share)	$ 15.50
Offering cost			$ 15.6
Proceeds from sale of common stock			$ 340.9
Treasury Stock, Shares, Acquired			0	0	10,646,382
Average cost (in dollars per share)					$ 50.62
Average cost, commission (in dollars per share)					$ 0.02
Stock compensation plans
Class of Stock [Line Items]
Common stock authorized and unissued (in shares)			13,700,000
Settlement of Convertible Notes
Class of Stock [Line Items]
Common stock authorized and unissued (in shares)			40,000,000