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Shareholders' Equity (Schedule Of Activity In Our Various Shareholders' Equity) (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
BALANCE |  |  |  | $ 8,222.9 |  |  |  |  | $ 8,222.9 |  |
Net income | $ (2,470.3) | $ 293.8 | $ 262.7 | $ 327.9 | $ (3,448.5) | $ 432.9 | $ (1,169.6) | $ 296.7 | (1,585.9) | $ (3,888.5) | $ 1,427.9
Net other comprehensive income (loss) |  |  |  |  |  |  |  |  | 0.6 | (6.3) | $ (1.9)
BALANCE | $ 6,517.2 |  |  |  | $ 8,222.9 |  |  |  | $ 6,517.2 | $ 8,222.9 |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
BALANCE, shares |  |  |  | 240.7 |  |  |  | 239.6 | 240.7 | 239.6 | 237.7
BALANCE |  |  |  | $ 24.2 |  |  |  | $ 24.1 | $ 24.2 | $ 24.1 | $ 23.9
Shares issued under share-based compensation plans, net, shares |  |  |  |  |  |  |  |  | 2.4 | 1.1 | 1.9
Shares issued under share-based compensation plans, net |  |  |  |  |  |  |  |  | $ 0.2 | $ 0.1 | $ 0.2
BALANCE, shares | 243.1 |  |  |  | 240.7 |  |  |  | 243.1 | 240.7 | 239.6
BALANCE | $ 24.4 |  |  |  | $ 24.2 |  |  |  | $ 24.4 | $ 24.2 | $ 24.1
Additional Paid-In Capital [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
BALANCE |  |  |  | 5,517.5 |  |  |  | 5,467.2 | 5,517.5 | 5,467.2 | 5,398.7
Shares issued under share-based compensation plans, net |  |  |  |  |  |  |  |  | 0.0 | 0.4 | 21.8
Tax benefit (deficiency) from share-based compensation |  |  |  |  |  |  |  |  | (2.4) | 1.2 | 0.1
Share-based compensation cost |  |  |  |  |  |  |  |  | 39.4 | 48.7 | 46.6
BALANCE | 5,554.5 |  |  |  | 5,517.5 |  |  |  | 5,554.5 | 5,517.5 | 5,467.2
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
BALANCE |  |  |  | 2,720.4 |  |  |  | 7,327.3 | 2,720.4 | 7,327.3 | 6,434.7
Net income |  |  |  |  |  |  |  |  | (1,594.8) | (3,902.6) | 1,418.2
Cash dividends paid |  |  |  |  |  |  |  |  | (140.3) | (704.3) | (525.6)
BALANCE | 985.3 |  |  |  | 2,720.4 |  |  |  | 985.3 | 2,720.4 | 7,327.3
AOCI [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
BALANCE |  |  |  | 11.9 |  |  |  | 18.2 | 11.9 | 18.2 | 20.1
Net other comprehensive income (loss) |  |  |  |  |  |  |  |  | 0.6 | (6.3) | (1.9)
BALANCE | 12.5 |  |  |  | 11.9 |  |  |  | 12.5 | 11.9 | 18.2
Treasury Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
BALANCE |  |  |  | (59.0) |  |  |  | (45.2) | (59.0) | (45.2) | (31.0)
Shares issued under share-based compensation plans, net |  |  |  |  |  |  |  |  | (0.2) | (0.1) | (0.1)
Repurchase of shares |  |  |  |  |  |  |  |  | (4.6) | (13.7) | (14.1)
BALANCE | (63.8) |  |  |  | (59.0) |  |  |  | (63.8) | (59.0) | (45.2)
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
BALANCE |  |  |  | $ 7.9 |  |  |  | $ 7.3 | 7.9 | 7.3 | 5.7
Net income |  |  |  |  |  |  |  |  | 8.9 | 14.1 | 9.7
Distributions to noncontrolling interests |  |  |  |  |  |  |  |  | (12.5) | (13.5) | (8.1)
BALANCE | $ 4.3 |  |  |  | $ 7.9 |  |  |  | $ 4.3 | $ 7.9 | $ 7.3

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- Definition This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415241&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11178-113907 + Details
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