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Shareholders' Equity (Shares Repurchased Under Share Repurchase Program) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2014 Treasury Stock [Member] | Sep. 30, 2014 Stock Repurchase Program Board Authorized Repurchases [Member] | Sep. 30, 2013 Stock Repurchase Program Board Authorized Repurchases [Member] | Sep. 30, 2014 Stock Repurchase Program Board Authorized Repurchases [Member] | Sep. 30, 2013 Stock Repurchase Program Board Authorized Repurchases [Member] | Oct. 27, 2014 Subsequent Event [Member] Stock Repurchase Program Board Authorized Repurchases [Member] | Oct. 20, 2014 Subsequent Event [Member] Stock Repurchase Program Board Authorized Repurchases [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Additional authorization under share repurchase program |  |  |  |  |  |  |  | $ 250
Shares repurchased (in shares) |  |  | 4.4 | 0 | 8.0 | 0.1 | 1.4 |
Aggregate purchase price | 418.2 | 418.2 | 235.9 | 0 | 415.7 | 4.9 | 68.5 |
Average purchase price per share (in dollars per share) |  |  | $ 53.15 | $ 0.00 | $ 51.98 | $ 40.81 | $ 49.29 |
Amount available for share repurchases under the share repurchase program |  |  |  |  |  |  | $ 281.5 |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + 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 cost 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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