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Equity Method Investments and Variable Interest Entities (Details) - USD ($) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Oct. 17, 2017
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Revenue |  | $ 136.0 | $ 58.3 |  |
Equity Method Investment, Summarized Financial Information, Cost of Sales |  | 85.1 | 33.4 |  |
Equity Method Investment, Summarized Financial Information, Depreciation and Amortization |  | 13.4 | 16.6 |  |
Equity Method Investment, Summarized Financial Information, Selling, general and administrative expense |  | 5.2 | 6.4 |  |
Equity Method Investment, Summarized Financial Information, Gain (Loss) on disposal of property, plant and equipment |  | 0.6 | 0.1 |  |
Equity Method Investment, Summarized Financial Information, Income (Loss) from Continuing Operations |  | 31.7 | 1.8 |  |
Equity Method Investment, Summarized Financial Information, Interest Expense |  | (9.7) | (5.6) |  |
Equity Method Investment, Summarized Financial Information, Income Tax Expense (benefit) |  | 7.7 | (1.2) |  |
Equity Method Investment, Summarized Financial Information, Net Income (Loss) |  | 14.3 | (2.6) |  |
Income (Loss) from Equity Method Investments |  | 7.1 | (1.3) |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Current Assets |  | 367.8 |  | $ 348.9 |
Equity Method Investment, Summarized Financial Information, Noncurrent Assets |  | 925.8 |  | 727.0 |
Equity Method Investment, Summarized Financial Information, Assets |  | 1,293.6 |  | 1,075.9 |
Equity Method Investment, Summarized Financial Information, Current Liabilities |  | 183.0 |  | 112.2 |
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities |  | 1,053.4 |  | 949.1 |
Equity Method Investment, Summarized Financial Information, Liabilities |  | 1,236.4 |  | 1,061.3 |
Long-term note receivable from unconsolidated subsidiary |  | 454.5 |  | 456.0 |
Interest income |  | 11.1 | 6.9 |  |
Revenue from Related Parties |  | 47.2 | 23.3 |  |
Proceeds from disposals of property and equipment |  | 0.4 | 1.3 |  |
Gain (Loss) on Disposition of Property Plant Equipment |  | $ 0.3 | 1.3 |  |
Saudi Arabia Joint Venture [Member] | Parent Company [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |
Income (Loss) from Equity Method Investments |  | $ 7.1 |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Interest income |  |  | (1.3) |  |
Accounts Payable, Related Parties |  | 3.0 |  | 6.1 |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure [Abstract] |  |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets |  | 558.0 |  | 566.0 |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities |  | 3.0 |  | 6.1 |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  | 555.0 |  | 559.9 |
Accounts Receivable [Member] | Saudi Arabia Joint Venture [Member] | Parent Company [Member] |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Accounts Receivable, Related Parties |  | 50.8 |  | $ 68.8 |
Prepaid Expenses and Other Current Assets [Member] | Saudi Arabia Joint Venture [Member] | Parent Company [Member] |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Due from Joint Ventures, Current |  | 5.7 |  |  |
Rig Management Services [Member] |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Costs and Expenses, Related Party |  | 0.0 | 10.6 |  |
Secondment Revenue [Member] |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Revenue from Related Parties |  | 20.9 | 14.3 |  |
Lease Revenue [Member] |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Revenue from Related Parties |  | 21.4 | 0.0 |  |
Transition Services Revenue [Member] |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Revenue from Related Parties |  | 4.9 | 9.0 |  |
ARO Drilling [Member] |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Proceeds from disposals of property and equipment |  | 0.3 | 1.2 |  |
Gain (Loss) on Disposition of Property Plant Equipment |  | $ 0.0 | 0.6 |  |
Saudi Aramco [Member] | Saudi Arabia Joint Venture [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  |
London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Loans Receivable, Basis Spread on Variable Rate |  |  |  |  | 2.00%
Interest Income [Member] | Saudi Arabia Joint Venture [Member] | Parent Company [Member] |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Interest income | $ 1.3 | $ 5.7 | 2.8 |  |
Operating Segments [Member] |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |
Income (Loss) from Equity Method Investments |  | 0.0 | 0.0 |  |
Operating Segments [Member] | ARO Segment [Member] |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |
Income (Loss) from Equity Method Investments |  | 0.0 | $ 0.0 |  |
Bess Brants and Ernest Dees [Member] | Accounts Receivable [Member] |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Accounts Receivable, Related Parties |  | 14.3 |  |  |
EXL I and EXL IV [Member] | Accounts Receivable [Member] |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Accounts Receivable, Related Parties |  | $ 14.3 |  |  |

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