Convertible Senior Notes - Capped Call and Common Stock Forward (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended			3 Months Ended
	May 18, 2020	Apr. 30, 2021	Nov. 30, 2020	Aug. 31, 2020	Mar. 31, 2021	Dec. 31, 2020	Jan. 07, 2021	Jan. 01, 2021	Jul. 01, 2020	May 31, 2020	May 29, 2020	Sep. 30, 2019	Mar. 31, 2018	Mar. 18, 2018
Capped Call and Common Stock Forward
Interest rate (as a percent)					3.75%			3.75%
Share Price			$ 22.25	$ 10.25
Common stock shares issued			43,700,000	35,276,250
Common Stock Forward
Capped Call and Common Stock Forward
Common stock shares issued						4,400,000
Net cost incurred					$ 27.5
Number of shares settled		2,200,000			5,900,000
3.75% Convertible Senior Notes
Capped Call and Common Stock Forward
Interest rate (as a percent)	3.75%				3.75%					3.75%	3.75%
Share Price					$ 35.84
3.75% Convertible Senior Notes | Capped Call
Capped Call and Common Stock Forward
Capped call options amount	$ 16.2
Cap price	$ 6.7560
Premium (as a percent)	60.00%
Share Price	$ 4.11
5.5% Convertible Senior Notes
Capped Call and Common Stock Forward
Interest rate (as a percent)	5.50%				5.50%	5.50%	5.50%			5.50%			5.50%	5.50%
5.5% Convertible Senior Notes | Capped Call
Capped Call and Common Stock Forward
Capped call options amount										$ 16.0
5.5% Convertible Senior Notes | Common Stock Forward
Capped Call and Common Stock Forward
Common stock shares issued					14,397,906
7.5% Convertible Senior Note
Capped Call and Common Stock Forward
Interest rate (as a percent)									7.50%			7.50%