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Derivative Instruments (Gains And Losses On Derivatives Designated As Cash Flow Hedges) (Details) - Foreign Exchange Forward - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Apr. 30, 2021 | Jun. 30, 2020
Cash Flow Hedges |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion) | $ 0.0 | $ 0.0 | $ 4.8 | $ 0.0 | $ (8.1)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) | $ 0.0 | $ 0.0 | (10.9) | (5.6) | (11.0)
Contract Drilling | Cash Flow Hedges |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) |  |  | (1.6) |  | (2.5)
Depreciation Expense | Cash Flow Hedges |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) |  |  | $ 12.5 |  | $ 13.5
Loss on Impairment |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) |  |  |  | $ 5.6 |

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