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Benefit Plans and Other Postretirement Benefits, OPEB benefit obligation and benefit expense (Details) - Other Postretirement Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure
Projected benefit obligation	$ 8.4	$ 13.1
Benefit obligation discount rate (as a percent)	4.06%	3.29%
Components of net postretirement benefit expense
Net postretirement benefit expense	$ 0.8	$ 0.9	$ 1.1

X

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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