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GM Cost Sharing (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |
Total GM postretirement cost sharing asset | $ 232.9 | $ 265.5
Current GM postretirement cost sharing asset | 13.5 |
Noncurrent GM postretirement cost sharing asset | $ 219.4 | $ 252.2

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- Definition Amounts estimated to be received from General Motors Company (GM), within one year of the balance sheet date, that relate to an agreement between us and GM to share proportionally in the cost of other postretirement employee benefits for eligible retirees based on the length of service an employee had with us and GM. + References No definition available. + Details
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- Definition Amounts estimated to be received from General Motors Company (GM), beyond one year of the balance sheet date, that relate to an agreement between us and GM to share proportionally in the cost of other postretirement employee benefits for eligible retirees based on the length of service an employee had with us and GM. + References No definition available. + Details
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- Definition Aggregate of the current and noncurrent amounts estimated to be received from General Motors Company (GM) associated with an agreement between us and GM to share proportionally in the cost of other postretirement employee benefits for eligible retirees based on the length of service an employee had with us and GM. + References No definition available. + Details
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- References No definition available. + Details
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