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Net Income Per Share of Class A and Class B Common Stock (Tables) | 9 Months Ended
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Sep. 30, 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):
Three Months Ended September 30, |  | 2019 |  | 2018
(in millions, except per share data) |  | Class A |  | Class B |  | Class A |  | Class B
Net income applicable to common stockholders - basic |  | $ | 83.0 |  |  | $ | 2.2 |  |  | $ | 89.3 |  |  | $ | 3.8 |
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 |  | 2.0 |  |  | — |  |  | 3.5 |  |  | — |
Net income applicable to common stockholders - diluted |  | $ | 85.2 |  |  | $ | 2.2 |  |  | $ | 93.1 |  |  | $ | 3.8 |
Weighted average common shares outstanding – basic |  | 22.6 |  |  | 0.6 |  |  | 23.2 |  |  | 1.0 |
Conversion of Class B common shares into Class A common shares |  | 0.6 |  |  | — |  |  | 1.0 |  |  | — |
Effect of dilutive stock options on weighted average common shares |  | 0.2 |  |  | — |  |  | 0.1 |  |  | — |
Weighted average common shares outstanding – diluted |  | 23.4 |  |  | 0.6 |  |  | 24.3 |  |  | 1.0 |
Net income per common share - basic |  | $ | 3.67 |  |  | $ | 3.67 |  |  | $ | 3.85 |  |  | $ | 3.85 |
Net income per common share - diluted |  | $ | 3.64 |  |  | $ | 3.64 |  |  | $ | 3.84 |  |  | $ | 3.84 |
Nine Months Ended September 30, |  | 2019 |  | 2018
(in millions, except per share data) |  | Class A |  | Class B |  | Class A |  | Class B
Net income applicable to common stockholders - basic |  | $ | 198.2 |  |  | $ | 5.3 |  |  | $ | 197.5 |  |  | $ | 8.3 |
Reallocation of net income due to conversion of Class B to Class A common shares outstanding |  | 0.6 |  |  | — |  |  | 0.8 |  |  | — |
Conversion of Class B common shares into Class A common shares |  | 4.7 |  |  | — |  |  | 7.5 |  |  | — |
Net income applicable to common stockholders - diluted |  | $ | 203.5 |  |  | $ | 5.3 |  |  | $ | 205.8 |  |  | $ | 8.3 |
Weighted average common shares outstanding – basic |  | 22.6 |  |  | 0.6 |  |  | 23.7 |  |  | 1.0 |
Conversion of Class B common shares into Class A common shares |  | 0.6 |  |  | — |  |  | 1.0 |  |  | — |
Effect of employee stock purchases and restricted stock units on weighted average common shares |  | 0.1 |  |  | — |  |  | 0.1 |  |  | — |
Weighted average common shares outstanding – diluted |  | 23.3 |  |  | 0.6 |  |  | 24.8 |  |  | 1.0 |
Net income per common share - basic |  | $ | 8.77 |  |  | $ | 8.77 |  |  | $ | 8.34 |  |  | $ | 8.34 |
Net income per common share - diluted |  | $ | 8.72 |  |  | $ | 8.72 |  |  | $ | 8.31 |  |  | $ | 8.31 |

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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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