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Employee Retirement Plans (Pension Plans) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net pension income	$ 2.7	$ 1.5	$ 8.0	$ 4.5
Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost	(3.4)	(4.4)	(10.2)	(13.2)
Expected return on plan assets	6.1	5.9	18.2	17.7
Net pension income	$ 2.7	$ 1.5	8.0	$ 4.5
Pension Plans | Non-qualified
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Benefit payments on non-qualified pension plans			1.2
Pension Plans | Qualified
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Contributions on qualified pension plans			$ 1.3

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- Definition

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

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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