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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$ 504.6	$ 548.2	$ 909.6	$ 814.0	$ 828.3	$ 1,012.2	$ 1,059.0	$ 1,163.9	$ 2,776.4	$ 4,063.4	$ 4,564.5
Operating expenses - Contract drilling (exclusive of depreciation)	289.0	298.1	350.2	363.7	415.2	433.5	502.6	518.3	1,301.0	1,869.6	2,076.9
Loss on impairment					2,744.0	2.4	0.0	0.0	0.0	2,746.4	4,218.7
Depreciation	110.2	109.4	112.4	113.3	149.7	145.2	140.5	137.1	445.3	572.5	537.9
General and administrative	24.7	25.3	27.4	23.4	30.2	28.4	29.7	30.1	100.8	118.4	131.9
OPERATING INCOME	80.7	$ 115.4	$ 419.6	$ 313.6	(2,510.8)	$ 402.7	$ 386.2	$ 478.4	929.3	(1,243.5)	(2,400.9)
Property and equipment, net	10,919.3				11,087.8				10,919.3	11,087.8	12,534.8
Capital expenditures									322.2	1,619.5	1,566.7
Floaters [Member]
Segment Reporting Information [Line Items]
Revenues									1,771.1	2,466.0	2,697.6
Operating expenses - Contract drilling (exclusive of depreciation)									725.0	1,052.8	1,201.2
Loss on impairment										1,778.4	3,982.3
Depreciation									304.1	382.4	358.1
General and administrative									0.0	0.0	0.0
OPERATING INCOME									742.0	(747.6)	(2,844.0)
Property and equipment, net	8,300.4				8,535.6				8,300.4	8,535.6	9,462.3
Capital expenditures									110.3	1,176.6	855.5
Jackups [Member]
Segment Reporting Information [Line Items]
Revenues									929.5	1,445.6	1,774.6
Operating expenses - Contract drilling (exclusive of depreciation)									516.8	693.5	807.4
Loss on impairment										968.0	236.4
Depreciation									123.7	175.7	171.2
General and administrative									0.0	0.0	0.0
OPERATING INCOME									289.0	(391.6)	559.6
Property and equipment, net	2,561.0				2,481.2				2,561.0	2,481.2	2,995.3
Capital expenditures									206.2	434.7	666.3
Other [Member]
Segment Reporting Information [Line Items]
Revenues									75.8	151.8	92.3
Operating expenses - Contract drilling (exclusive of depreciation)									59.2	123.3	68.3
Loss on impairment											0.0
Depreciation									0.0	0.0	0.0
General and administrative									0.0	0.0	0.0
OPERATING INCOME									16.6	28.5	24.0
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]
Revenues									2,776.4	4,063.4	4,564.5
Operating expenses - Contract drilling (exclusive of depreciation)									1,301.0	1,869.6	2,076.9
Loss on impairment										2,746.4	4,218.7
Depreciation									427.8	558.1	529.3
General and administrative									0.0	0.0	0.0
OPERATING INCOME									1,047.6	(1,110.7)	(2,260.4)
Property and equipment, net	10,861.4				11,016.8				10,861.4	11,016.8	12,457.6
Capital expenditures									316.5	1,611.3	1,521.8
Reconciling Items [Member]
Segment Reporting Information [Line Items]
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									17.5	14.4	8.6
General and administrative									100.8	118.4	131.9
OPERATING INCOME									(118.3)	(132.8)	(140.5)
Property and equipment, net	$ 57.9				$ 71.0				57.9	71.0	77.2
Capital expenditures									$ 5.7	$ 8.2	$ 44.9

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