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Net Income Per Common Share Computations (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Earnings Per Share [Abstract] |  |  |
Net income from continuing operations | $ 249.1 | $ 13.3 | $ 139.6
Net loss attributable to noncontrolling interest | 0.0 | (0.2) | (0.3)
Net income from continuing operations, net of loss attributable to noncontrolling interests | 249.1 | 13.5 | 139.9
Net loss from discontinued operations | 0.0 | (95.4) | (2.4)
Numerator for basic net income (loss) per common share | 249.1 | (81.9) | 137.5
Numerator for diluted net income from continuing operations per common share | 249.1 | 13.5 | 139.9
Numerator for diluted net income (loss) per common share | $ 249.1 | $ (81.9) | $ 137.5
Denominator for net income (loss) per common share: |  |  |
Basic (in shares) | 38.6 | 39.6 | 40.1
Plus dilutive effect of stock awards (in shares) | 0.6 | 0.5 | 0.5
Diluted (in shares) | 39.2 | 40.1 | 40.6
Basic |  |  |
Continuing operations (in dollars per share) | $ 6.45 | $ 0.34 | $ 3.49
Discontinued operations (in dollars per share) | 0 | (2.41) | (0.06)
Net income (loss) per common share - basic (in dollars per share) | 6.45 | (2.07) | 3.43
Diluted |  |  |
Continuing operations (in dollars per share) | 6.35 | 0.33 | 3.44
Discontinued operations (in dollars per share) | 0 | (2.41) | (0.06)
Net income (loss) per common share - diluted (in dollars per share) | $ 6.35 | $ (2.08) | $ 3.38

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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) from continuing operations available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 40 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1930-109256 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 40 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1930-109256 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 40 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1930-109256 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1505-109256 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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