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Repurchase of Common Stock (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2016 | Jan. 30, 2016 | Jan. 27, 2018 | Feb. 25, 2016 | Jun. 30, 2011
June 2011 share repurchase program [Domain] |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | 3.3 |  |  |  |
Stock Repurchased and Retired During Period, Value | $ 101.0 |  |  |  |
January 2016 ASR [Domain] |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | 1.6 | 4.4 |  |  |
Stock Repurchased and Retired During Period, Shares | 1.7 |  |  |  |
Stock Repurchased and Retired During Period, Value | $ 45.0 | $ 120.0 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 2,900.0 | $ 3,000.0 |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 1,000.0 | $ 5,000.0
Stock Repurchase Program, Period in Force |  |  | 2 years |  |
Open market [Domain] | June 2011 share repurchase program [Domain] |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Unsettled shares, shares | 0.1 |  |  |  |
Stock Repurchased and Retired During Period, Value | $ 56.0 |  |  |  |
Unsettled shares, cost | $ 4.0 |  |  |  |

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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Number of shares that have been repurchased and retired during the period. + 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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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + 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, 31 -Article 5 + Details
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