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Net Income Per Share of Class A and Class B Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | Following is a reconciliation of net income and weighted average shares used for our basic earnings per share (“EPS”) and diluted EPS (in millions, except per share amounts):
Year Ended December 31, |  | 2019 |  | 2018 |  | 2017
(in millions, except per share data) |  | Class A |  | Class B |  | Class A |  | Class B |  | Class A |  | Class B
Net income from continuing operations applicable to common stockholders |  | $ | 264.5 |  |  | $ | 7.0 |  |  | $ | 254.8 |  |  | $ | 10.9 |  |  | $ | 233.4 |  |  | $ | 11.8 |
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding |  | 0.7 |  |  | — |  |  | 1.1 |  |  | — |  |  | 1.3 |  |  | — |
Conversion of Class B common shares into Class A common shares |  | 6.3 |  |  | — |  |  | 9.8 |  |  | — |  |  | 10.5 |  |  | — |
Net income applicable to common stockholders - diluted |  | $ | 271.5 |  |  | $ | 7.0 |  |  | $ | 265.7 |  |  | $ | 10.9 |  |  | $ | 245.2 |  |  | $ | 11.8 |
Weighted average common shares outstanding – basic |  | 22.6 |  |  | 0.6 |  |  | 23.4 |  |  | 1.0 |  |  | 23.9 |  |  | 1.2 |
Conversion of Class B common shares into Class A common shares |  | 0.6 |  |  | — |  |  | 1.0 |  |  | — |  |  | 1.2 |  |  | — |
Effect of employee stock purchases and restricted stock units on weighted average common shares |  | 0.2 |  |  | — |  |  | 0.1 |  |  | — |  |  | — |  |  | — |
Weighted average common shares outstanding – diluted |  | 23.4 |  |  | 0.6 |  |  | 24.5 |  |  | 1.0 |  |  | 25.1 |  |  | 1.2 |
Net income per common share - basic |  | $ | 11.70 |  |  | $ | 11.70 |  |  | $ | 10.91 |  |  | $ | 10.91 |  |  | $ | 9.78 |  |  | $ | 9.78 |
Net income per common share - diluted |  | $ | 11.60 |  |  | $ | 11.60 |  |  | $ | 10.86 |  |  | $ | 10.86 |  |  | $ | 9.75 |  |  | $ | 9.75 |
Antidilutive Securities |  |  |  |  |  |  |  |  |  |  |  |
Shares issuable pursuant to employee stock purchases not included since they were antidilutive |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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