Employee Benefit Plans (Plan Asset Targets and Values) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	100.00%	100.00%
Defined Benefit Plan, Plan Assets, Amount	$ 32.5	$ 31.3
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	1.00%	0.00%
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Range for Target Allocation, Percentage	60.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	68.00%	79.00%
Equity funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Range for Target Allocation, Percentage	40.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	27.00%	0.00%
Balanced Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	4.00%	0.00%
Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	0.00%	10.00%
Foreign equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	0.00%	11.00%
Fair Value Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 0.0	$ 31.2
Fair Value Measured at NAV | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0.0	24.6
Fair Value Measured at NAV | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0.0	3.2
Fair Value Measured at NAV | Foreign equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0.0	3.4
Fair Value, Measurements, Recurring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	32.5	0.1
Fair Value, Measurements, Recurring | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0.3	0.1
Fair Value, Measurements, Recurring | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	22.2	0.0
Fair Value, Measurements, Recurring | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	8.8	0.0
Fair Value, Measurements, Recurring | Balanced Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1.2	0.0
Fair Value, Measurements, Recurring | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	32.5	0.1
Fair Value, Measurements, Recurring | Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0.3	0.1
Fair Value, Measurements, Recurring | Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	22.2	0.0
Fair Value, Measurements, Recurring | Level 1 | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	8.8	0.0
Fair Value, Measurements, Recurring | Level 1 | Balanced Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 1.2	$ 0.0
Minimum | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Range for Target Allocation, Percentage	50.00%
Minimum | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Range for Target Allocation, Percentage	20.00%
Maximum | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Range for Target Allocation, Percentage	80.00%
Maximum | Equity funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Range for Target Allocation, Percentage	50.00%