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Rowan Transaction Schedule of Recognized Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions		3 Months Ended
	Apr. 11, 2019	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Business Combination, Bargain Purchase, Gain Recognized, Amount		$ 0.0	$ 16.6
Rowan Companies [Member]
Business Acquisition [Line Items]
Business Acquisition, Transaction Costs		9.4
Business Combination, Acquired Receivables, Gross Contractual Amount		$ 201.1
Scenario, Forecast [Member] | Rowan Companies [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 928.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	199.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other	200.0
Business Combination, Acquired Receivable, Fair Value	454.5
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value	152.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	2,755.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	184.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	252.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt	181.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	1,910.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	372.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	2,158.3
Business Combination, Consideration Transferred	1,404.6
Business Combination, Bargain Purchase, Gain Recognized, Amount	$ 753.7

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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