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Segment Information (Schedule Of Segment Reporting Information) (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($) contract	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) contract	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Document Period End Date									Dec. 31, 2018
Number of drilling management contracts | contract	2								2
Revenues	$ 399.0	$ 430.9	$ 458.5	$ 417.0	$ 454.2	$ 460.2	$ 457.5	$ 471.1	$ 1,705.4	$ 1,843.0	$ 2,776.4
Operating expenses - Contract drilling (exclusive of depreciation)	322.8	327.1	344.3	325.2	334.3	285.8	291.3	278.1	1,319.4	1,189.5	1,301.0
Loss on impairment	40.3	0.0	0.0	0.0	182.9	0.0	0.0	0.0	40.3	182.9	0.0
Depreciation expense	122.4	120.6	120.7	115.2	119.5	108.2	107.9	109.2	478.9	444.8	445.3
General and administrative	23.6	25.1	26.1	27.9	70.9	30.4	30.5	26.0	102.7	157.8	100.8
OPERATING INCOME (LOSS)	(110.1)	$ (41.9)	$ (32.6)	$ (51.3)	(253.4)	$ 35.8	$ 27.8	$ 57.8	(235.9)	(132.0)	929.3
Property and equipment, net	12,616.2				12,873.7				12,616.2	12,873.7	10,919.3
Capital expenditures									426.7	536.7	322.2
Floaters [Member]
Segment Reporting Information [Line Items]
Revenues									1,013.5	1,143.5	1,771.1
Operating expenses - Contract drilling (exclusive of depreciation)									737.4	624.2	725.0
Loss on impairment									0.0	174.7
Depreciation expense									311.8	297.4	304.1
General and administrative									0.0	0.0	0.0
OPERATING INCOME (LOSS)									(35.7)	47.2	742.0
Property and equipment, net	9,465.6				9,650.9				9,465.6	9,650.9	8,300.4
Capital expenditures									105.5	470.3	110.3
Jackups [Member]
Segment Reporting Information [Line Items]
Revenues									630.9	640.3	929.5
Operating expenses - Contract drilling (exclusive of depreciation)									526.5	512.1	516.8
Loss on impairment									40.3	8.2
Depreciation expense									153.3	131.5	123.7
General and administrative									0.0	0.0	0.0
OPERATING INCOME (LOSS)									(89.2)	(11.5)	289.0
Property and equipment, net	3,114.1				3,177.6				3,114.1	3,177.6	2,561.0
Capital expenditures									317.7	62.1	206.2
Other [Member]
Segment Reporting Information [Line Items]
Revenues									61.0	59.2	75.8
Operating expenses - Contract drilling (exclusive of depreciation)									55.5	53.2	59.2
Loss on impairment									0.0	0.0
Depreciation expense									0.0	0.0	0.0
General and administrative									0.0	0.0	0.0
OPERATING INCOME (LOSS)									5.5	6.0	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									1,705.4	1,843.0	2,776.4
Operating expenses - Contract drilling (exclusive of depreciation)									1,319.4	1,189.5	1,301.0
Loss on impairment									40.3	182.9
Depreciation expense									465.1	428.9	427.8
General and administrative									0.0	0.0	0.0
OPERATING INCOME (LOSS)									(119.4)	41.7	1,047.6
Property and equipment, net	12,579.7				12,828.5				12,579.7	12,828.5	10,861.4
Capital expenditures									423.2	532.4	316.5
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 expense									13.8	15.9	17.5
General and administrative									102.7	157.8	100.8
OPERATING INCOME (LOSS)									(116.5)	(173.7)	(118.3)
Property and equipment, net	$ 36.5				$ 45.2				36.5	45.2	57.9
Capital expenditures									$ 3.5	$ 4.3	$ 5.7

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