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Pension and Other Postretirement Benefits Pension Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Contributions to pension and other post-retirement benefit plans	$ 8.0
Additional contributions		$ 6.6
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net projected benefit obligations		239.3
Pension Plan | Rowan Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net projected benefit obligations, current		$ 19.2

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