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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) $ 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
Segment Reporting Information [Line Items]
Revenues	$ 828.3	$ 1,012.2	$ 1,059.0	$ 1,163.9	$ 1,159.8	$ 1,201.4	$ 1,136.6	$ 1,066.7	$ 4,063.4	$ 4,564.5	$ 4,323.4
Operating expenses - Contract drilling (exclusive of depreciation)	415.2	433.5	502.6	518.3	514.0	500.2	542.5	520.2	1,869.6	2,076.9	1,947.1
Asset Impairment Charges	2,744.0	2.4	0.0	0.0	3,515.2	0.0	703.5	0.0	2,746.4	4,218.7	0.0
Depreciation	149.7	145.2	140.5	137.1	139.4	135.2	132.2	131.1	572.5	537.9	496.2
General and administrative	30.2	28.4	29.7	30.1	28.3	29.3	36.2	38.1	118.4	131.9	146.8
OPERATING INCOME	(2,510.8)	$ 402.7	$ 386.2	$ 478.4	(3,037.1)	$ 536.7	$ (277.8)	$ 377.3	(1,243.5)	(2,400.9)	1,733.3
Property and equipment, net	11,087.8				12,534.8				11,087.8	12,534.8	14,311.0
Capital expenditures									1,619.5	1,566.7	1,763.5
Floaters [Member]
Segment Reporting Information [Line Items]
Revenues									2,466.0	2,697.6	2,659.6
Operating expenses - Contract drilling (exclusive of depreciation)									1,052.8	1,201.2	1,126.0
Asset Impairment Charges									1,778.4	3,982.3
Depreciation									382.4	358.1	342.2
General and administrative									0.0	0.0	0.0
OPERATING INCOME									(747.6)	(2,844.0)	1,191.4
Property and equipment, net	8,535.6				9,462.3				8,535.6	9,462.3	11,303.4
Capital expenditures									1,176.6	855.5	1,028.6
Jackups [Member]
Segment Reporting Information [Line Items]
Revenues									1,445.6	1,774.6	1,588.7
Operating expenses - Contract drilling (exclusive of depreciation)									693.5	807.4	762.6
Asset Impairment Charges									968.0	236.4
Depreciation									175.7	171.2	147.5
General and administrative									0.0	0.0	0.0
OPERATING INCOME									(391.6)	559.6	678.6
Property and equipment, net	2,481.2				2,995.3				2,481.2	2,995.3	2,961.6
Capital expenditures									434.7	666.3	708.3
Other [Member]
Segment Reporting Information [Line Items]
Revenues									151.8	92.3	75.1
Operating expenses - Contract drilling (exclusive of depreciation)									$ 123.3	68.3	58.5
Asset Impairment Charges										0.0
Depreciation									$ 0.0	0.0	0.0
General and administrative									0.0	0.0	0.0
OPERATING INCOME									28.5	24.0	16.6
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									4,063.4	4,564.5	4,323.4
Operating expenses - Contract drilling (exclusive of depreciation)									1,869.6	2,076.9	1,947.1
Asset Impairment Charges									2,746.4	4,218.7
Depreciation									558.1	529.3	489.7
General and administrative									0.0	0.0	0.0
OPERATING INCOME									(1,110.7)	(2,260.4)	1,886.6
Property and equipment, net	11,016.8				12,457.6				11,016.8	12,457.6	14,265.0
Capital expenditures									1,611.3	1,521.8	1,736.9
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
Asset Impairment Charges									0.0	0.0
Depreciation									14.4	8.6	6.5
General and administrative									118.4	131.9	146.8
OPERATING INCOME									(132.8)	(140.5)	(153.3)
Property and equipment, net	$ 71.0				$ 77.2				71.0	77.2	46.0
Capital expenditures									$ 8.2	$ 44.9	$ 26.6

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