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Derivative Instruments (Gains And Losses On Derivatives Designated As Cash Flow Hedges) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Interest Rate Lock Contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion) | [1] | $ 0.0 | $ 0.0
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) | [1],[2] | 0.1 | 0.1
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) | [1],[3] | 0.0 | 0.0
Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion) | [4] | 0.0 | 1.9
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) | [2],[4] | 1.5 | (2.3)
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) | [3],[4] | 0.0 | (0.2)
Foreign Exchange Forward [Member] | Contract Drilling [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) |  | (1.7) | 2.1
Foreign Exchange Forward [Member] | Depreciation Expense [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) |  | 0.2 | 0.2
Cash Flow Hedges [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion) |  | 0.0 | 1.9
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion) | [2] | 1.6 | (2.2)
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) | [3] | 0.0 | $ (0.2)
Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount |  | 191.8 |
Not Designated as Hedging Instrument [Member] | Qatar, Rials | Fair Value Hedging [Member] | Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount |  | 18.5 |
Not Designated as Hedging Instrument [Member] | Indonesia, Rupiahs | Fair Value Hedging [Member] | Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount |  | $ 10.1 |
[1] | Losses on interest rate lock derivatives reclassified from AOCI into income (effective portion) were included in interest expense, net, in our condensed consolidated statements of operations.
[2] | Changes in the fair value of cash flow hedges are recorded in AOCI. Amounts recorded in AOCI associated with cash flow hedges are subsequently reclassified into contract drilling, depreciation or interest expense as earnings are affected by the underlying hedged forecasted transaction.
[3] | Gains and losses recognized in income for ineffectiveness and amounts excluded from effectiveness testing were included in other, net, in our condensed consolidated statements of operations.
[4] | During the first quarter of 2019, $1.7 million of losses were reclassified from AOCI into contract drilling expense and $0.2 million of gains were reclassified from AOCI into depreciation expense in our condensed consolidated statement of operations. During the prior year quarter, $2.1 million of gains were reclassified from AOCI into contract drilling expense and $0.2 million of gains were reclassified from AOCI into depreciation expense in our condensed consolidated statement of operations.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + Details
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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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