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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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