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Income (loss) per Share (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Nov. 15, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price (usd per share)	$ 39.76	$ 39.88	$ 40.02	$ 40.02
Undistributed earnings (loss) allocated to participating securities, diluted	$ 100,000	$ 0	$ 1,500,000
Antidilutive weighted average shares (in shares)	0.1	1.1	1.3
Notes Due 2023 | Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion price (usd per share)	$ 25.35	$ 0	$ 25.51	$ 25.51

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Exercise price per share or per unit of warrants or rights outstanding.

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The price per share of the conversion feature embedded in the debt instrument.

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