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Income Taxes (Narrative) (Details) € in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 EUR (€)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Apr. 11, 2019 USD ($)
Income Tax Contingency [Line Items]
Discrete Income Tax Expense (Benefit)	$ 18.4	$ 7.9		$ 19.0	$ 19.1
Income tax expense, adjusted for discrete items	19.9	$ 31.2		84.6	$ 85.5
Tax Assessment				42.0
Deferred tax assets	988.0			988.0
Rowan Companies
Income Tax Contingency [Line Items]
Deferred tax assets						$ 100.0
Rowan Companies | Luxembourg Inland Revenue
Income Tax Contingency [Line Items]
Tax Assessment | €			€ 93.0
Unrecognized tax benefit, maximum exposure			€ 142.0	155.0
Rowan Companies | Australian Taxation Office
Income Tax Contingency [Line Items]
Tax Assessment				101.0
Unrecognized tax benefit, maximum exposure	$ 29.0			$ 68.0

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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