Long-term Compensation Plans - Activity in Payment Awards (Details) - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total
Beginning balance (in shares)	3,890,643	3,890,643
Granted (in shares)		3,634,086
Exercised (in shares)		(1,968,471)
Canceled (in shares)		(66,117)
Forfeited (in shares)		(656,375)
Ending balance (in shares)		4,833,766	3,890,643
Equity Classified
Granted (in shares)	2,400,000
Stock Options
Beginning balance (in shares)	536,772	536,772
Granted (in shares)		229,724		256,202
Exercised (in shares)		(245,098)
Cancelled (in shares)		(66,117)
Forfeited (in shares)		(106,272)
Ending balance (in shares)		349,009	536,772
RSUs
Equity Classified
Beginning balance (in shares)	3,034,193	3,034,193
Granted (in shares)		3,404,362	1,581,444	1,117,719
Exercised (in shares)		(1,723,373)
Forfeited (in shares)		(525,522)
Ending balance (in shares)		4,189,660	3,034,193
Liability Classified
Outstanding, beginning balance (in shares)	319,678	319,678
Forfeited (in shares)		(24,581)
Outstanding, ending balance (in shares)		295,097	319,678