Earnings per Common Share - Reconciliation of Weighted Average Number of Common Shares Outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Weighted average common shares outstanding – basic (in shares)	203,255,000	179,598,000	141,415,000
Dilutive effect of share-based awards (in shares)	1,532,000	1,660,000	2,662,000
Equity forward contract (in shares)	2,153,000	2,692,000	261,000
Weighted average common shares outstanding – diluted (in shares)	206,940,000	183,950,000	144,338,000