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Net Income Per Share of Class A and Class B Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Weighted average common shares outstanding – basic | 23.2 | 24.4 | 25.1
Weighted average common shares outstanding – diluted | 23.4 | 24.5 | 25.1
Net income per common share - basic (in dollars per share) | $ 11.70 | $ 10.91 | $ 9.78
Net income per common share - diluted (in dollars per share) | $ 11.60 | $ 10.86 | $ 9.75
Class A common stock |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income from continuing operations applicable to common stockholders | $ 264.5 | $ 254.8 | $ 233.4
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 | $ 265.7 | $ 245.2
Weighted average common shares outstanding – basic | 22.6 | 23.4 | 23.9
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 | 0.0
Weighted average common shares outstanding – diluted | 23.4 | 24.5 | 25.1
Net income per common share - basic (in dollars per share) | $ 11.70 | $ 10.91 | $ 9.78
Net income per common share - diluted (in dollars per share) | $ 11.60 | $ 10.86 | $ 9.75
Class A common stock | Employee Stock Option |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Shares issuable pursuant to employee stock purchases not included since they were antidilutive | 0.0 | 0.0 | 0.0
Class B common stock |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income from continuing operations applicable to common stockholders | $ 7.0 | $ 10.9 | $ 11.8
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding | 0.0 | 0.0 | 0.0
Conversion of Class B common shares into Class A common shares | 0.0 | 0.0 | 0.0
Net income applicable to common stockholders - diluted | $ 7.0 | $ 10.9 | $ 11.8
Weighted average common shares outstanding – basic | 0.6 | 1.0 | 1.2
Conversion of Class B common shares into Class A common shares | 0.0 | 0.0 | 0.0
Effect of employee stock purchases and restricted stock units on weighted average common shares | 0.0 | 0.0 | 0.0
Weighted average common shares outstanding – diluted | 0.6 | 1.0 | 1.2
Net income per common share - basic (in dollars per share) | $ 11.70 | $ 10.91 | $ 9.78
Net income per common share - diluted (in dollars per share) | $ 11.60 | $ 10.86 | $ 9.75
Class B common stock | Employee Stock Option |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Shares issuable pursuant to employee stock purchases not included since they were antidilutive | 0.0 | 0.0 | 0.0

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