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Equity Narratives (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Oct. 28, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Dividends declared per share |  | $ 0.12 | $ 0.09 | $ 0.32 | $ 0.25 |
Dividends, Common Stock, Cash |  |  |  | $ 23.7 |  |
Treasury Stock, Shares, Acquired |  | 11,008,576 |  |  | 0 |
Treasury Stock, Value, Acquired, Par Value Method |  |  |  | $ 305.5 |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  | $ 27.75 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 321.6 |  | $ 321.6 |  |
Subsequent Event [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 619,905 |  |  |  |  |
Treasury Stock, Value, Acquired, Par Value Method | $ 17.5 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 28.17 |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  | $ 304.1

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + 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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