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Postretirement Benefit Obligations - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2018
Retirement Benefits [Abstract] |  |  |  |
Pension contributions | $ 3.3 | $ 6.6 | $ 2.0 | $ 12.0

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