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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Weighted average common shares outstanding - basic (in shares) | 23.2 | 24.2 | 23.2 | 24.7
Weighted average common shares outstanding - diluted (in shares) | 23.4 | 24.3 | 23.3 | 24.8
Net income per common share - basic (in dollars per share) | $ 3.67 | $ 3.85 | $ 8.77 | $ 8.34
Net income per common share - diluted (in dollars per share) | $ 3.64 | $ 3.84 | $ 8.72 | $ 8.31
Class A common stock |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income applicable to common stockholders - basic | $ 83.0 | $ 89.3 | $ 198.2 | $ 197.5
Reallocation of net income due to conversion of Class B to Class A common shares outstanding | 0.2 | 0.3 | 0.6 | 0.8
Conversion of Class B common shares into Class A common shares | 2.0 | 3.5 | 4.7 | 7.5
Net income applicable to common stockholders - diluted | $ 85.2 | $ 93.1 | $ 203.5 | $ 205.8
Weighted average common shares outstanding - basic (in shares) | 22.6 | 23.2 | 22.6 | 23.7
Conversion of Class B common shares into Class A common shares (in shares) | 0.6 | 1.0 | 0.6 | 1.0
Effect of dilutive stock options on weighted average common shares (in shares) | 0.2 | 0.1 | 0.1 | 0.1
Weighted average common shares outstanding - diluted (in shares) | 23.4 | 24.3 | 23.3 | 24.8
Net income per common share - basic (in dollars per share) | $ 3.67 | $ 3.85 | $ 8.77 | $ 8.34
Net income per common share - diluted (in dollars per share) | $ 3.64 | $ 3.84 | $ 8.72 | $ 8.31
Class B common stock |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income applicable to common stockholders - basic | $ 2.2 | $ 3.8 | $ 5.3 | $ 8.3
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 | $ 2.2 | $ 3.8 | $ 5.3 | $ 8.3
Weighted average common shares outstanding - basic (in shares) | 0.6 | 1.0 | 0.6 | 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) | 0.6 | 1.0 | 0.6 | 1.0
Net income per common share - basic (in dollars per share) | $ 3.67 | $ 3.85 | $ 8.77 | $ 8.34
Net income per common share - diluted (in dollars per share) | $ 3.64 | $ 3.84 | $ 8.72 | $ 8.31

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1337-109256 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=117327953&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1252-109256 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117326831&loc=SL5780133-109256 + Details
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