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Earnings Per Share - Additional Information (Details) - $ / shares shares in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2019
Earnings Per Share [Abstract] |  |
Number or shares repurchased during period (in shares) | 1.2 | 2.7
Average price of shares repurchased during period (in dollars per share) | $ 82.11 | $ 91.26

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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