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Revenue from Contracts with Customers Future Amortization of Liabilities and Deferred Costs (Details) $ in Millions | Sep. 30, 2018 USD ($)
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Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining duration of drilling contracts | 3 months
Revenue, Remaining Performance Obligation, Amount | $ 23.3
Capitalized Contract Cost, Amortization Expense, Remainder Of Fiscal Year | $ 11.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining duration of drilling contracts | 1 year
Revenue, Remaining Performance Obligation, Amount | $ 48.5
Capitalized Contract Cost, Amortization Expense, Year Two | $ 21.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining duration of drilling contracts | 1 year
Revenue, Remaining Performance Obligation, Amount | $ 6.4
Capitalized Contract Cost, Amortization Expense, Year Three | 6.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Amount | 4.2
Capitalized Contract Cost, Amortization Expense, Year Four And Thereafter | 2.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil) |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Amount | 82.4
Capitalized Contract Cost, Net | $ 42.0

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