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Equity Narratives (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Jun. 30, 2015 | Apr. 30, 2015
Dividends declared per share | $ 0.10 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.08 us-gaap_CommonStockDividendsPerShareDeclared |  |
Treasury Stock, Shares, Acquired | 3,084,558 us-gaap_TreasuryStockSharesAcquired | 0 us-gaap_TreasuryStockSharesAcquired |  |
Treasury Stock, Value, Acquired, Par Value Method | $ 73.2 us-gaap_TreasuryStockValueAcquiredParValueMethod |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 23.74 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 167.1 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |
Subsequent Event [Member] |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 841,500 us-gaap_TreasuryStockSharesAcquired / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Treasury Stock, Value, Acquired, Par Value Method |  |  | 22.7 us-gaap_TreasuryStockValueAcquiredParValueMethod / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 26.96 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  | $ 144.4 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 Amount remaining of a stock repurchase plan authorized. + References No definition available. + 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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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 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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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the par value method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 3: 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 Reference 4: 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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