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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly financial information |
|  | 2019 |  |  |  |  |  |  |  |
(in millions, except per share data) |  | First |  | Second |  | Third |  | Fourth |  | Year
Revenues |  | $ | 1,071.9 |  |  | $ | 1,314.8 |  |  | $ | 1,280.6 |  |  | $ | 1,144.3 |  |  | $ | 4,811.6 |
Gross margin |  | 288.6 |  |  | 394.2 |  |  | 380.2 |  |  | 308.7 |  |  | 1,371.7 |
Operating income |  | 114.7 |  |  | 207.2 |  |  | 191.0 |  |  | 141.3 |  |  | 654.2 |
Income from continuing operations |  | 77.4 |  |  | 153.0 |  |  | 139.3 |  |  | 104.0 |  |  | 473.7 |
Income (loss) from discontinued operations |  | 2.0 |  |  | (0.1) |  |  | (1.4) |  |  | (1.4) |  |  | (0.9) |
Net income |  | 79.4 |  |  | 152.9 |  |  | 137.9 |  |  | 102.6 |  |  | 472.8 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |
Income from continuing operations (1) |  | $ | 1.34 |  |  | $ | 2.68 |  |  | $ | 2.45 |  |  | $ | 1.84 |  |  | $ | 8.30 |
Income (loss) from discontinued operations (1) |  | 0.03 |  |  | — |  |  | (0.02) |  |  | (0.03) |  |  | (0.02) |
Basic earnings per share (1) |  | $ | 1.37 |  |  | $ | 2.68 |  |  | $ | 2.43 |  |  | $ | 1.81 |  |  | $ | 8.28 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |
Income from continuing operations (1) |  | $ | 1.33 |  |  | $ | 2.65 |  |  | $ | 2.42 |  |  | $ | 1.81 |  |  | $ | 8.21 |
Income (loss) from discontinued operations (1) |  | 0.03 |  |  | — |  |  | (0.02) |  |  | (0.03) |  |  | (0.02) |
Diluted earnings per share (1) |  | $ | 1.36 |  |  | $ | 2.65 |  |  | $ | 2.40 |  |  | $ | 1.78 |  |  | $ | 8.19 |
(1)The sum of quarterly earnings per share amounts may not equal the year due to differences in weighted-average share calculation.
|  | 2018 |  |  |  |  |  |  |  |
(in millions, except per share data) |  | First |  | Second |  | Third |  | Fourth |  | Year
Revenues |  | $ | 984.7 |  |  | $ | 1,236.1 |  |  | $ | 1,181.4 |  |  | $ | 1,077.3 |  |  | $ | 4,479.5 |
Gross margin |  | 249.4 |  |  | 332.2 |  |  | 314.3 |  |  | 278.8 |  |  | 1,174.7 |
Operating income |  | 94.7 |  |  | 159.7 |  |  | 140.0 |  |  | 114.6 |  |  | 509.0 |
Income from continuing operations |  | 57.9 |  |  | 114.7 |  |  | 96.9 |  |  | 89.1 |  |  | 358.6 |
Income (loss) from discontinued operations |  | 251.7 |  |  | (1.0) |  |  | 2.8 |  |  | (1.0) |  |  | 252.5 |
Net income |  | 309.6 |  |  | 113.7 |  |  | 99.7 |  |  | 88.1 |  |  | 611.1 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |
Income from continuing operations (1) |  | $ | 0.93 |  |  | $ | 1.88 |  |  | $ | 1.61 |  |  | $ | 1.50 |  |  | $ | 5.92 |
Income (loss) from discontinued operations (1) |  | 4.05 |  |  | (0.02) |  |  | 0.05 |  |  | (0.02) |  |  | 4.17 |
Basic earnings per share (1) |  | $ | 4.98 |  |  | $ | 1.86 |  |  | $ | 1.66 |  |  | $ | 1.48 |  |  | $ | 10.09 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |
Income from continuing operations (1) |  | $ | 0.92 |  |  | $ | 1.87 |  |  | $ | 1.59 |  |  | $ | 1.49 |  |  | $ | 5.88 |
Income (loss) from discontinued operations (1) |  | 4.02 |  |  | (0.02) |  |  | 0.05 |  |  | (0.02) |  |  | 4.14 |
Diluted earnings per share (1) |  | $ | 4.94 |  |  | $ | 1.85 |  |  | $ | 1.64 |  |  | $ | 1.47 |  |  | $ | 10.02 |
(1)The sum of quarterly earnings per share amounts may not equal the year due to differences in weighted-average share calculation.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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