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New accounting standards ASU 2017-07 (Details 2) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net unrealized gains on investments used to satisfy obligations under nonqualified benefit plans | $ 2.1 | $ 1.9 | $ 3.0 | $ 6.9
Accounting Standards Update 2017-07 [Member] | Other Income [Member] | Restatement Adjustment [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Defined benefit plan, net periodic benefit cost (credit) |  | 1.5 |  | 4.5
Net unrealized gains on investments used to satisfy obligations under nonqualified benefit plans |  | $ 2.6 |  | $ 7.9

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