Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

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Earnings Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Mar. 27, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Antidilutive securities excluded from computation of diluted earnings per share
Sale of stock, number of shares issued in transaction (in shares)	12,270,900		2,000,000
Common stock, par value (in dollars per share)			$ 50.00
Sale of stock, consideration received on transaction		$ 593.6
Over-Allotment Option
Antidilutive securities excluded from computation of diluted earnings per share
Sale of stock, number of shares issued in transaction (in shares)			300,000
Additional Over-Allotment Option
Antidilutive securities excluded from computation of diluted earnings per share
Sale of stock, number of shares issued in transaction (in shares)			270,900
Private Placement
Antidilutive securities excluded from computation of diluted earnings per share
Sale of stock, number of shares issued in transaction (in shares)			10,000,000
Common stock, par value (in dollars per share)			$ 50.00
Stock options
Antidilutive securities excluded from computation of diluted earnings per share
Antidilutive securities excluded from computation of diluted earnings per share (in shares)				267,987	391,875	286,487	398,650
Restricted stock
Antidilutive securities excluded from computation of diluted earnings per share
Antidilutive securities excluded from computation of diluted earnings per share (in shares)				348,486	363,683	465,574	428,172