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Net Income Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jun. 06, 2017 | Mar. 07, 2016
Stock Repurchase Program, Authorized Amount | $ 1,000.0 |  | $ 500.0 | $ 500.0
Treasury Stock Acquired, Average Cost Per Share | $ 50.77 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 258.9 |  |  |
Common Class A [Member] |  |  |  |
Treasury Stock, Shares, Acquired | 1,600,000 |  |  |
Employee Stock Option [Member] |  |  |  |
Antidilutive securities excluded from EPS | 388,000 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Antidilutive securities excluded from EPS | 170,000 |  |  |
Performance Shares [Member] |  |  |  |
Antidilutive securities excluded from EPS | 195,000 | 175,000 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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