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Shareholders' Equity (Schedule Of Activity In Our Various Shareholders' Equity) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
BALANCE |  |  |  | $ 8,730.0 |  |  |  |  |  | $ 8,730.0 |  |
Net income (loss) | $ (203.1) | $ (142.9) | $ (150.1) | $ (140.5) | $ (207.1) | $ (28.2) | $ (44.3) | $ (24.6) |  | (636.6) | $ (304.2) | $ 897.1
Stock Issued During Period, Shares, New Issues |  |  | 65,550,000 |  | 1,822,432 |  |  |  |  |  | 1,822,432 |
Net other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | (11.2) | $ 9.6 | $ 6.5
BALANCE | $ 8,088.8 |  |  |  | $ 8,730.0 |  |  |  |  | $ 8,088.8 | $ 8,730.0 |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
BALANCE, shares |  |  |  | 447,000,000 |  |  |  | 310,300,000 | 242,900,000 | 447,000,000 | 310,300,000 | 242,900,000
BALANCE |  |  |  | $ 44.8 |  |  |  | $ 31.1 | $ 24.4 | $ 44.8 | $ 31.1 | $ 24.4
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  |  |  |  | 132,200,000 | 65,600,000
Stock Issued During Period, Value, New Issues |  |  |  |  |  |  |  |  |  |  | $ 13.2 | $ 6.5
Shares Issued Under Share Based Compensation Plans, Shares |  |  |  |  |  |  |  |  |  | 13,700,000 | 4,500,000 |
Conversion of Stock, Shares Issued |  |  |  |  |  |  |  |  |  |  |  | 1,800,000
Conversion of Stock, Amount Issued |  |  |  |  |  |  |  |  |  |  |  | $ 0.2
Shares issued under share-based compensation plans, net |  |  |  |  |  |  |  |  |  | $ 1.4 | $ 0.5 |
BALANCE, shares | 460,700,000 |  |  |  | 447,000,000 |  |  |  |  | 460,700,000 | 447,000,000 | 310,300,000
BALANCE | $ 46.2 |  |  |  | $ 44.8 |  |  |  |  | $ 46.2 | $ 44.8 | $ 31.1
Additional Paid-In Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
BALANCE |  |  |  | 7,195.0 |  |  |  | 6,402.2 | 5,554.5 | 7,195.0 | 6,402.2 | 5,554.5
Stock Issued During Period, Value, New Issues |  |  |  |  |  |  |  |  |  |  | 757.5 | 579.0
Conversion of Stock, Amount Issued |  |  |  |  |  |  |  |  |  |  |  | 14.8
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  |  |  |  |  |  |  |  |  |  | 220.0
Shares issued under share-based compensation plans, net |  |  |  |  |  |  |  |  |  | (0.6) | (0.4) |
Tax benefit (deficiency) from share-based compensation |  |  |  |  |  |  |  |  | (3.4) |  |  |
Repurchase of shares |  |  |  |  |  |  |  |  |  | 0.0 |  |
Share-based compensation cost |  |  |  |  |  |  |  |  | 37.3 | 30.6 | 35.7 |
BALANCE | 7,225.0 |  |  |  | 7,195.0 |  |  |  |  | 7,225.0 | 7,195.0 | 6,402.2
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
BALANCE |  |  |  | 1,532.7 |  |  |  | 1,864.1 | 985.3 | 1,532.7 | 1,864.1 | 985.3
Net income (loss) |  |  |  |  |  |  |  |  | 890.2 | (639.7) | (303.7) |
Cash dividends paid |  |  |  |  |  |  |  |  | (11.4) | (18.0) | (13.6) |
BALANCE | 874.2 |  |  |  | 1,532.7 |  |  |  |  | 874.2 | 1,532.7 | 1,864.1
AOCI [Member] |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
BALANCE |  |  |  | 28.6 |  |  |  | 19.0 | 12.5 | 28.6 | 19.0 | 12.5
Net other comprehensive income (loss) |  |  |  |  |  |  |  |  | 6.5 | (11.2) | 9.6 |
BALANCE | 18.2 |  |  |  | 28.6 |  |  |  |  | 18.2 | 28.6 | 19.0
Treasury Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
BALANCE |  |  |  | (69.0) |  |  |  | (65.8) | (63.8) | (69.0) | (65.8) | (63.8)
Shares issued under share-based compensation plans, net |  |  |  |  |  |  |  |  |  | (1.3) | (1.3) |
Repurchase of shares |  |  |  |  |  |  |  |  | (2.0) | (1.9) | (1.9) |
BALANCE | (72.2) |  |  |  | (69.0) |  |  |  |  | (72.2) | (69.0) | (65.8)
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
BALANCE |  |  |  | $ (2.1) |  |  |  | 4.4 | 4.3 | (2.1) | 4.4 | 4.3
Net income (loss) |  |  |  |  |  |  |  |  | 6.9 | 3.1 | (0.5) |
Distributions to noncontrolling interests |  |  |  |  |  |  |  |  | $ (7.8) | (3.6) | (6.0) |
Proceeds from Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  | 1.0
BALANCE | $ (2.6) |  |  |  | $ (2.1) |  |  |  |  | (2.6) | (2.1) | $ 4.4
Accounting Standards Update 2016-16 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  |  |  |  |  |  |  | $ (14.1) |
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  |  |  |  | $ (14.1) |  |  |  |
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-16 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  |  |  |  |  |  | (0.8) |  |
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-16 [Member] | AOCI [Member] |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  |  |  |  |  |  | $ 0.8 |  |

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