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Leases (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Operating Leased Assets [Line Items] |  |  |  |  |
Operating Lease, Right-of-Use Asset |  | $ 57.1 |  | $ 57.1 | $ 0.0
Operating Lease, Liability, Current |  | 21.5 |  | 21.5 | 0.0
Operating Lease, Liability, Noncurrent |  | 48.6 |  | 48.6 | $ 0.0
Minimum [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating Lease, Payments |  | 7.2 |  |  |
Lessee, Operating Lease, Remaining Lease Terms |  |  | 1 year |  |
Maximum [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating Lease, Payments |  |  |  | 14.2 |
Lessee, Operating Lease, Remaining Lease Terms |  |  | 11 years |  |
Rowan Companies [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating Lease, Right-of-Use Asset |  | 12.2 |  | 12.2 |
Operating Lease, Liability, Current |  | 3.9 |  | 3.9 |
Operating Lease, Liability, Noncurrent |  | $ 10.6 |  | $ 10.6 |
Scenario, Forecast [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating Lease, Payments | $ 9.6 |  |  |  |

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Lessee, Operating Lease, Remaining Lease Terms + References No definition available. + Details
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