Subsequent Event - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
	Oct. 31, 2020	Jan. 31, 2020	Jun. 30, 2019	Jan. 31, 2019	Sep. 30, 2019
Subsequent Event [Line Items]
Stock issued in transaction (shares)		3,538,462	2,415,000	1,854,838
Sale price of common stock (USD per share)		$ 97.50		$ 62.00	$ 97.00
Proceeds from sale of stock		$ 324.0	$ 219.9	$ 107.9
Subsequent Event | Common Stock
Subsequent Event [Line Items]
Stock issued in transaction (shares)	4,585,706
Sale price of common stock (USD per share)	$ 202.00
Proceeds from sale of stock	$ 879.7