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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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