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Net Income Per Share of Class A and Class B Common Stock (Earnings Per Share Reconciliation) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Weighted average common shares outstanding - basic (in shares) | 23.4 | 24.8 | 23.2 | 24.9
Weighted average common shares outstanding - diluted (in shares) | 23.5 | 24.9 | 23.3 | 25.0
Net income per common share - basic (in dollars per share) | $ 2.65 | $ 2.45 | $ 5.10 | $ 4.52
Net income per common share - diluted (in dollars per share) | $ 2.63 | $ 2.44 | $ 5.08 | $ 4.50
Class A common stock |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income applicable to common stockholders - basic | $ 59.8 | $ 58.2 | $ 114.2 | $ 108.2
Reallocation of net income due to conversion of Class B to Class A common shares outstanding | 0.2 | 0.3 | 0.5 | 0.6
Conversion of Class B common shares into Class A common shares | 1.9 | 2.2 | 3.6 | 3.9
Net income applicable to common stockholders - diluted | $ 61.9 | $ 60.7 | $ 118.3 | $ 112.7
Weighted average common shares outstanding - basic (in shares) | 22.6 | 23.8 | 22.4 | 23.9
Conversion of Class B common shares into Class A common shares (in shares) | 0.8 | 1.0 | 0.8 | 1.0
Effect of dilutive stock options on weighted average common shares (in shares) | 0.1 | 0.1 | 0.1 | 0.1
Weighted average common shares outstanding - diluted (in shares) | 23.5 | 24.9 | 23.3 | 25.0
Net income per common share - basic (in dollars per share) | $ 2.65 | $ 2.45 | $ 5.10 | $ 4.52
Net income per common share - diluted (in dollars per share) | $ 2.63 | $ 2.44 | $ 5.08 | $ 4.50
Class B common stock |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income applicable to common stockholders - basic | $ 2.1 | $ 2.5 | $ 4.1 | $ 4.5
Reallocation of net income due to conversion of Class B to Class A common shares outstanding | 0.0 | 0.0 | 0.0 | 0.0
Conversion of Class B common shares into Class A common shares | 0.0 | 0.0 | 0.0 | 0.0
Net income applicable to common stockholders - diluted | $ 2.1 | $ 2.5 | $ 4.1 | $ 4.5
Weighted average common shares outstanding - basic (in shares) | 0.8 | 1.0 | 0.8 | 1.0
Conversion of Class B common shares into Class A common shares (in shares) | 0.0 | 0.0 | 0.0 | 0.0
Effect of dilutive stock options on weighted average common shares (in shares) | 0.0 | 0.0 | 0.0 | 0.0
Weighted average common shares outstanding - diluted (in shares) | 0.8 | 1.0 | 0.8 | 1.0
Net income per common share - basic (in dollars per share) | $ 2.65 | $ 2.45 | $ 5.10 | $ 4.52
Net income per common share - diluted (in dollars per share) | $ 2.63 | $ 2.44 | $ 5.08 | $ 4.50

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