Supplemental Information (Earnings Per Share) (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share Reconciliation [Abstract]
Weighted-average Common Shares Outstanding – Basic	256,300,000	247,000,000.0	245,600,000
Assumed settlement of performance share units and restricted stock units	1,300,000	1,200,000	1,400,000
Dilutive effect of forward sale agreements	0	500,000	100,000
Weighted Average Number of Shares Outstanding, Diluted (in shares)	257,600,000	248,700,000	247,100,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)		0	0