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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
May. 13, 2015 | Feb. 26, 2015 | May. 15, 2013 | Sep. 30, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Jul. 21, 2015
Common stock dividends paid |  |  |  |  |  |  | $ 93.5 | $ 78.6 |  |
Dividends declared per common share | $ 0.55 | $ 0.55 |  |  | $ 0.55 | $ 0.40 | $ 1.10 | $ 0.80 |  |
Repurchases of common stock |  |  |  |  |  |  | $ 43.3 | $ 0.0 |  |
Shares of common stock repurchased |  |  |  |  |  |  | 603,835 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Common stock dividends paid |  |  |  | $ 53.8 |  |  |  |  |  |
Share Repurchase Program [Domain] |  |  |  |  |  |  |  |  |  |
Remaining authorized amount for share repurchases |  |  |  |  |  |  |  |  |  | $ 205.0
Annual Dividend |  |  |  |  |  |  |  |  |  |
Dividends declared per common share |  |  | $ 1.60 |  |  |  |  |  | $ 2.20 |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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