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Stock-Based Compensation - Outstanding Awards and Exercises (Details) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($) $ / shares shares
Awards | Common Class A, Class B And Class C |
Compensation cost not yet recognized |
Shares reserved for future issuance upon exercise of stock options | 4,200,000
Awards | Series A common stock |
Options |
Outstanding ending balance (in shares) | 1,000
WAEP |
WAEP Outstanding ending balance (in dollars per share) | $ / shares | $ 35.81
Options additional disclosures |
Weighted average remaining contractual life outstanding | 1 year 8 months 12 days
Awards | Series B common stock |
Options |
Outstanding ending balance (in shares) | 722,000
WAEP |
WAEP Outstanding ending balance (in dollars per share) | $ / shares | $ 96.79
Options additional disclosures |
Weighted average remaining contractual life outstanding | 1 year 10 months 24 days
Options |
Compensation cost not yet recognized |
Unrecognized compensation cost options | $ | $ 68.9
Period over which unrecognized compensation cost will be recognized | 1 year 10 months 24 days
Options | Series A common stock |
Options |
Options granted (in shares) | 0
Options | Series B common stock |
Options |
Options granted (in shares) | 0
Options | Series C common stock |
Options |
Outstanding beginning balance (in shares) | 3,327,000
Options granted (in shares) | 199,000
Exercised (in shares) | (3,000)
Outstanding ending balance (in shares) | 3,523,000
Number of awards exercisable (in shares) | 2,052,000
WAEP |
WAEP Outstanding beginning balance (in dollars per share) | $ / shares | $ 92.35
WAEP Options granted (in dollars per share) | $ / shares | 152.25
WAEP options exercised (in dollars per share) | $ / shares | 73.85
WAEP Outstanding ending balance (in dollars per share) | $ / shares | 95.74
WAEP options exercisable (in dollars per share) | $ / shares | $ 59.39
Options additional disclosures |
Weighted average remaining contractual life outstanding | 4 years 10 months 24 days
Weighted average remaining contractual life exercisable | 3 years 9 months 18 days
Aggregate intrinsic value outstanding | $ | $ 202.0
Aggregate intrinsic value exercisable | $ | $ 186.0

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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