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Equity Stock-Based Compensation (Details) - $ / shares shares in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2018
Employee Stock Option |  |  |
Options Granted in Period |  | 0.4 |
Options Granted in Period, Weighted Average Exercise Price |  | $ 25.35 |
Restricted Stock Units (RSUs) |  |  |
Non Options Granted in Period |  | 1.1 |
Non Options Granted in Period, Weighted Average Grant Date Fair Value |  | $ 25.45 |
Performance Shares and Restricted Stock Units |  |  |
Non Options Granted in Period | 0.8 |  |
Non Options Granted in Period, Weighted Average Grant Date Fair Value |  |  | $ 25.04

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- Definition Net number of non-option equity instruments granted to participants. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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