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Income Taxes (Narrative) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) jackup | Dec. 31, 2014 USD ($) jackup | Dec. 31, 2013 USD ($) jackup
Income Tax Expense (Benefit), Discrete Item |  |  |  |  |  |  |  |  |  |  | $ 18.4 |
Income from continuing operations before income taxes in the U.S. countries |  |  |  |  |  |  |  |  |  | $ (578.2) | (460.3) | $ 173.4
Income from continuing operations before income taxes in the non-U.S. countries |  |  |  |  |  |  |  |  |  | (893.0) | (2,100.0) | 1,500.0
Deferred tax assets related to U.S. foreign tax credits |  | $ 84.1 |  |  |  | $ 98.6 |  |  |  | 84.1 | 98.6 |
Deferred tax assets related to net operating loss carryforwards |  | 228.7 |  |  |  | 204.5 |  |  |  | 228.7 | 204.5 |
Net operating loss carryforwards |  | 979.2 |  |  |  |  |  |  |  | 979.2 |  |
Operating loss carryforwards, Not subject to expiration |  | 599.0 |  |  |  |  |  |  |  | 599.0 |  |
Operating loss carryforwards, Subject to expiration |  | 380.2 |  |  |  |  |  |  |  | 380.2 |  |
Valuation allowance on NOL carryforwards and FTC |  | 259.8 |  |  |  |  |  |  |  | 259.8 |  |
Valuation Allowance, Deferred Tax Asset, Change in Amount | $ 7.0 |  |  |  |  |  |  |  |  | 11.0 | 41.4 |
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
Consilidated effective income tax rate excluding discrete items |  |  |  |  |  |  |  |  |  | 16.00% | 10.70% | 12.20%
Minimum percentage threshold for recognition of tax benefits |  |  |  |  |  |  |  |  |  | 50.00% |  |
Total unrecognized tax benefits | 151.7 | 140.6 |  |  |  | 134.4 |  |  |  | $ 140.6 | $ 134.4 | $ 151.7
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions With Net Operating Loss Carryforwards |  |  |  |  |  |  |  |  |  | 21.3 | 18.5 |
Amount of unrecognized tax benefits affecting the consolidated effective income tax rate if recognized |  | 62.2 |  |  |  | 108.3 |  |  |  | 62.2 | 108.3 |
Amount of accrued interest and penalties included in other liabilities |  | 30.4 |  |  |  | 26.5 |  |  |  | 30.4 | 26.5 |
Amount of interest and penalties recognized in net tax expense |  |  |  |  |  |  |  |  |  | (3.9) | 9.2 | 1.6
Income tax benefits, inclusive of interest and penalties due to lapses in statute of limitations | 3.1 | 7.6 |  |  |  | 2.4 |  |  |  | 7.6 | $ 2.4 | $ 3.1
Decline in unrecognized tax benefits during next twelve months |  | 64.9 |  |  |  |  |  |  |  | 64.9 |  |
Accrued interest and penalty assessments related to the decline in unrecognized tax benefits |  | 9.5 |  |  |  |  |  |  |  | $ 9.5 |  |
Number of assets transferred (in drillships or jackups) | jackup |  |  |  |  |  |  |  |  |  | 1 | 3 | 2
Income tax liability from gain on intercompany transfers |  | 0.0 |  |  |  |  |  |  |  | $ 0.0 |  |
Unamortized deferred charges related to intercompany transfers |  | 37.1 |  |  |  | 39.7 |  |  |  | 37.1 | $ 39.7 |
Amount included in current income taxes for amortization of deferred income taxes related to intercompany transfers |  |  |  |  |  |  |  |  |  | 2.6 | 2.6 | $ 4.1
Deferred tax liability related to temporary difference from transferred drilling rigs | $ 23.0 | 21.2 |  |  |  |  |  |  |  | 21.2 |  | 23.0
Tax benefits included in deferred income tax expense related to amortization of deferred reversing temporary differences from intercompany transfers |  |  |  |  |  |  |  |  |  | 1.8 | 1.8 | 1.9
Undistributed Earnings of Foreign Subsidiaries |  | 2,300.0 |  |  |  |  |  |  |  | 2,300.0 |  |
Other Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized tax benefits |  | $ 119.3 |  |  |  | $ 115.9 |  |  |  | $ 119.3 | 115.9 |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Foreign, Expiration Date |  |  |  |  |  |  |  |  |  | 2022 |  |
Operating loss carryforwards tax credits expiration year |  |  |  |  |  |  |  |  |  | 2016 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Foreign, Expiration Date |  |  |  |  |  |  |  |  |  | 2023 |  |
Operating loss carryforwards tax credits expiration year |  |  |  |  |  |  |  |  |  | 2020 |  |
Mexican Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Gross |  |  |  |  |  |  |  |  |  |  |  | 7.4
Proceeds from Income Tax Refunds |  |  |  |  |  |  |  |  |  |  |  | $ 30.6
Rig Impairments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit), Discrete Item |  |  |  |  |  |  |  |  |  | $ 192.5 | $ 16.4 |

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