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Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
Income Taxes (Narrative) (Details) - USD ($)	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Contingency [Line Items]
Discrete Income Tax Expense (Benefit)	$ 1,200,000	$ 2,300,000	$ 600,000	$ 11,200,000
Income tax expense, adjusted for discrete items	$ 33,800,000	$ 27,000,000.0	64,700,000	$ 54,300,000
Tax Assessment			69,000,000
Rowan Companies [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Acquisition			$ 50,400,000