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Pension and Other Postretirement Benefits - Change in Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Change in fair value of plan assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 303.3
Employer contributions	1.8	$ 1.8
Fair value of assets at end of year	261.7	303.3
Defined Benefit Pension Plans [Member]
Change in fair value of plan assets [Roll Forward]
Fair value of plan assets at beginning of year	303.4	276.7
Actual return on plan assets	(24.6)	45.0
Employer contributions	1.8	1.8
Medicare Part D subsidy received	0.0	0.0
Benefits paid	(18.9)	(20.1)
Fair value of assets at end of year		303.4
Other Postretirement Benefit Plans [Member]
Change in fair value of plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	6.1	6.5
Medicare Part D subsidy received	0.3	0.4
Benefits paid	(6.4)	(6.9)
Fair value of assets at end of year	$ 0.0	$ 0.0

X

- Definition

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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