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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Income) (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
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
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
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
OTHER (EXPENSE) INCOME, NET | (69.8) | (77.7) | (84.8) | (70.7) | 87.3 | (40.4) | (53.2) | (57.7) |  | (303.0) | (64.0) | 68.2
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | (179.9) | (119.6) | (117.4) | (122.0) | (166.1) | (4.6) | (25.4) | 0.1 |  | (538.9) | (196.0) | 997.5
Total provision for income taxes | 23.2 | 23.3 | 24.7 | 18.4 | 42.4 | 23.4 | 19.3 | 24.1 |  | 89.6 | 109.2 | 108.5
DISCONTINUED OPERATIONS, NET | 0.0 | 0.0 | (8.0) | (0.1) | 1.4 | (0.2) | 0.4 | (0.6) | $ 8.1 | (8.1) | 1.0 | 8.1
EQUITY EARNINGS IN AFFILIATES, NET OF TAX |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
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
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS | (0.5) | (2.1) | (0.9) | 0.4 | 0.0 | 2.8 | (1.2) | (1.1) |  | (3.1) | 0.5 | (6.9)
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO | $ (203.6) | $ (145.0) | $ (151.0) | $ (140.1) | $ (207.1) | $ (25.4) | $ (45.5) | $ (25.7) |  | (639.7) | (303.7) | 890.2
Ensco Plc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 49.5 | 52.9 | 27.9
Contract drilling (exclusive of depreciation) |  |  |  |  |  |  |  |  |  | 51.0 | 50.0 | 27.3
Loss on impairment |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Depreciation expense |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
General and administrative |  |  |  |  |  |  |  |  |  | 46.3 | 45.4 | 36.2
OPERATING INCOME (LOSS) |  |  |  |  |  |  |  |  |  | (47.8) | (42.5) | (35.6)
OTHER (EXPENSE) INCOME, NET |  |  |  |  |  |  |  |  |  | 2.7 | (6.8) | 152.9
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES |  |  |  |  |  |  |  |  |  | (45.1) | (49.3) | 117.3
Total provision for income taxes |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
DISCONTINUED OPERATIONS, NET |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX |  |  |  |  |  |  |  |  |  | (594.6) | (254.4) | 772.9
NET INCOME (LOSS) |  |  |  |  |  |  |  |  |  | (639.7) | (303.7) | 890.2
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO |  |  |  |  |  |  |  |  |  | (639.7) | (303.7) | 890.2
ENSCO International Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 155.2 | 163.3 | 144.4
Contract drilling (exclusive of depreciation) |  |  |  |  |  |  |  |  |  | 139.5 | 149.9 | 144.8
Loss on impairment |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Depreciation expense |  |  |  |  |  |  |  |  |  | 14.2 | 15.9 | 17.2
General and administrative |  |  |  |  |  |  |  |  |  | 0.4 | 50.8 | 0.2
OPERATING INCOME (LOSS) |  |  |  |  |  |  |  |  |  | 1.1 | (53.3) | (17.8)
OTHER (EXPENSE) INCOME, NET |  |  |  |  |  |  |  |  |  | (135.2) | (110.5) | (79.0)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES |  |  |  |  |  |  |  |  |  | (134.1) | (163.8) | (96.8)
Total provision for income taxes |  |  |  |  |  |  |  |  |  | 43.3 | 45.0 | 0.7
DISCONTINUED OPERATIONS, NET |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX |  |  |  |  |  |  |  |  |  | 121.8 | 129.6 | 205.7
NET INCOME (LOSS) |  |  |  |  |  |  |  |  |  | (55.6) | (79.2) | 108.2
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO |  |  |  |  |  |  |  |  |  | (55.6) | (79.2) | 108.2
Pride International Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Contract drilling (exclusive of depreciation) |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.1
Loss on impairment |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Depreciation expense |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.4
General and administrative |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
OPERATING INCOME (LOSS) |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (0.5)
OTHER (EXPENSE) INCOME, NET |  |  |  |  |  |  |  |  |  | (89.0) | (71.7) | (76.6)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES |  |  |  |  |  |  |  |  |  | (89.0) | (71.7) | (77.1)
Total provision for income taxes |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (0.6)
DISCONTINUED OPERATIONS, NET |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX |  |  |  |  |  |  |  |  |  | 93.3 | 84.2 | 125.7
NET INCOME (LOSS) |  |  |  |  |  |  |  |  |  | 4.3 | 12.5 | 49.2
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO |  |  |  |  |  |  |  |  |  | 4.3 | 12.5 | 49.2
Other Non-Guarantor Subsidiaries Of Ensco [Member] |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,802.8 | 1,941.2 | 2,897.4
Contract drilling (exclusive of depreciation) |  |  |  |  |  |  |  |  |  | 1,431.0 | 1,304.0 | 1,422.1
Loss on impairment |  |  |  |  |  |  |  |  |  | 40.3 | 182.9 |
Depreciation expense |  |  |  |  |  |  |  |  |  | 464.7 | 428.9 | 427.7
General and administrative |  |  |  |  |  |  |  |  |  | 56.0 | 61.6 | 64.4
OPERATING INCOME (LOSS) |  |  |  |  |  |  |  |  |  | (189.2) | (36.2) | 983.2
OTHER (EXPENSE) INCOME, NET |  |  |  |  |  |  |  |  |  | (109.0) | 110.5 | 7.8
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES |  |  |  |  |  |  |  |  |  | (298.2) | 74.3 | 991.0
Total provision for income taxes |  |  |  |  |  |  |  |  |  | 46.3 | 64.2 | 108.4
DISCONTINUED OPERATIONS, NET |  |  |  |  |  |  |  |  |  | (8.1) | 1.0 | 8.1
EQUITY EARNINGS IN AFFILIATES, NET OF TAX |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
NET INCOME (LOSS) |  |  |  |  |  |  |  |  |  | (352.6) | 11.1 | 890.7
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  | (3.1) | 0.5 | (6.9)
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO |  |  |  |  |  |  |  |  |  | (355.7) | 11.6 | 883.8
Consolidating Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (302.1) | (314.4) | (293.3)
Contract drilling (exclusive of depreciation) |  |  |  |  |  |  |  |  |  | (302.1) | (314.4) | (293.3)
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) |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
OTHER (EXPENSE) INCOME, NET |  |  |  |  |  |  |  |  |  | 27.5 | 14.5 | 63.1
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES |  |  |  |  |  |  |  |  |  | 27.5 | 14.5 | 63.1
Total provision for income taxes |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
DISCONTINUED OPERATIONS, NET |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX |  |  |  |  |  |  |  |  |  | 379.5 | 40.6 | (1,104.3)
NET INCOME (LOSS) |  |  |  |  |  |  |  |  |  | 407.0 | 55.1 | (1,041.2)
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO |  |  |  |  |  |  |  |  |  | $ 407.0 | $ 55.1 | $ (1,041.2)

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