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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
OPERATING REVENUES	$ 454.2	$ 460.2	$ 457.5	$ 471.1	$ 504.6	$ 548.2	$ 909.6	$ 814.0	$ 1,843.0	$ 2,776.4	$ 4,063.4
Operating expenses - Contract drilling (exclusive of depreciation)	334.3	285.8	291.3	278.1	289.0	298.1	350.2	363.7	1,189.5	1,301.0	1,869.6
Loss on impairment	182.9	0.0	0.0	0.0					182.9	0.0	2,746.4
Depreciation	119.5	108.2	107.9	109.2	110.2	109.4	112.4	113.3	444.8	445.3	572.5
General and administrative	70.9	30.4	30.5	26.0	24.7	25.3	27.4	23.4	157.8	100.8	118.4
OPERATING INCOME (LOSS)	(253.4)	$ 35.8	$ 27.8	$ 57.8	80.7	$ 115.4	$ 419.6	$ 313.6	(132.0)	929.3	(1,243.5)
Property and equipment, net	12,873.7				10,919.3				12,873.7	10,919.3	11,087.8
Capital expenditures									536.7	322.2	1,619.5
Floaters [Member]
Segment Reporting Information [Line Items]
OPERATING REVENUES									1,143.5	1,771.1	2,466.0
Operating expenses - Contract drilling (exclusive of depreciation)									624.2	725.0	1,052.8
Loss on impairment									174.7		1,778.4
Depreciation									297.4	304.1	382.4
General and administrative									0.0	0.0	0.0
OPERATING INCOME (LOSS)									47.2	742.0	(747.6)
Property and equipment, net	9,650.9				8,300.4				9,650.9	8,300.4	8,535.6
Capital expenditures									470.3	110.3	1,176.6
Jackups [Member]
Segment Reporting Information [Line Items]
OPERATING REVENUES									640.3	929.5	1,445.6
Operating expenses - Contract drilling (exclusive of depreciation)									512.1	516.8	693.5
Loss on impairment									8.2		968.0
Depreciation									131.5	123.7	175.7
General and administrative									0.0	0.0	0.0
OPERATING INCOME (LOSS)									(11.5)	289.0	(391.6)
Property and equipment, net	3,177.6				2,561.0				3,177.6	2,561.0	2,481.2
Capital expenditures									62.1	206.2	434.7
Other [Member]
Segment Reporting Information [Line Items]
OPERATING REVENUES									59.2	75.8	151.8
Operating expenses - Contract drilling (exclusive of depreciation)									53.2	59.2	123.3
Loss on impairment									0.0
Depreciation									0.0	0.0	0.0
General and administrative									0.0	0.0	0.0
OPERATING INCOME (LOSS)									6.0	16.6	28.5
Property and equipment, net	0.0				0.0				0.0	0.0	0.0
Capital expenditures									0.0	0.0	0.0
Operating Segments Total [Member]
Segment Reporting Information [Line Items]
OPERATING REVENUES									1,843.0	2,776.4	4,063.4
Operating expenses - Contract drilling (exclusive of depreciation)									1,189.5	1,301.0	1,869.6
Loss on impairment									182.9		2,746.4
Depreciation									428.9	427.8	558.1
General and administrative									0.0	0.0	0.0
OPERATING INCOME (LOSS)									41.7	1,047.6	(1,110.7)
Property and equipment, net	12,828.5				10,861.4				12,828.5	10,861.4	11,016.8
Capital expenditures									532.4	316.5	1,611.3
Reconciling Items [Member]
Segment Reporting Information [Line Items]
OPERATING REVENUES									0.0	0.0	0.0
Operating expenses - Contract drilling (exclusive of depreciation)									0.0	0.0	0.0
Loss on impairment									0.0		0.0
Depreciation									15.9	17.5	14.4
General and administrative									157.8	100.8	118.4
OPERATING INCOME (LOSS)									(173.7)	(118.3)	(132.8)
Property and equipment, net	$ 45.2				$ 57.9				45.2	57.9	71.0
Capital expenditures									$ 4.3	$ 5.7	$ 8.2

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