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Net Income Per Share of Class A and Class B Common Stock (Tables) | 3 Months Ended
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Mar. 31, 2020
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted |
Three Months Ended March 31, |  | 2020 |  | 2019
(in millions, except per share data) |  | Class A |  | Class B |  | Class A |  | Class B
Net income applicable to common stockholders - basic |  | $ | 45.0 |  |  | $ | 1.2 |  |  | $ | 54.4 |  |  | $ | 2.0 |
Reallocation of net income due to conversion of Class B to Class A common shares outstanding |  | 0.2 |  |  | — |  |  | 0.3 |  |  | — |
Conversion of Class B common shares into Class A common shares |  | 1.0 |  |  | — |  |  | 1.7 |  |  | — |
Net income applicable to common stockholders - diluted |  | $ | 46.2 |  |  | $ | 1.2 |  |  | $ | 56.4 |  |  | $ | 2.0 |
Weighted average common shares outstanding – basic |  | 22.7 |  |  | 0.6 |  |  | 22.3 |  |  | 0.8 |
Conversion of Class B common shares into Class A common shares |  | 0.6 |  |  | — |  |  | 0.8 |  |  | — |
Effect of employee stock purchases and restricted stock units on weighted average common shares |  | 0.2 |  |  | — |  |  | 0.1 |  |  | — |
Weighted average common shares outstanding – diluted |  | 23.5 |  |  | 0.6 |  |  | 23.2 |  |  | 0.8 |
Net income per common share - basic |  | $ | 1.99 |  |  | $ | 1.99 |  |  | $ | 2.43 |  |  | $ | 2.43 |
Net income per common share - diluted |  | $ | 1.97 |  |  | $ | 1.97 |  |  | $ | 2.42 |  |  | $ | 2.42 |

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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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