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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

X

- 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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X

- 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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X

- 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

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X

- 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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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Lessee, Operating Lease, Remaining Lease Terms

+ References

No definition available.

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