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Earnings (Loss) per Share - Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share Reconciliation
Net income (loss)	$ 50.7	$ 60.8
Basic and Diluted earnings (loss) per share
Basic earnings (loss) per share (usd per share)	$ 1.36	$ 1.56
Diluted earnings (loss) per share (usd per share)	$ 1.35	$ 1.55
Shares
Weighted average number of common shares outstanding - Basic (shares)	37,169	39,010
Weighted average additional shares assuming conversion of potential common shares (shares)	377	254
Shares - diluted basis (shares)	37,546	39,264

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
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