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Pension and Other Postretirement Benefits Pension Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Apr. 11, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation		$ 239.3
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation, Current		$ 19.2
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 4.0
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	10.7
Pension Plan [Member] | Rowan Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	$ 202.1

X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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-Publisher FASB
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Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets.

+ References

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