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Employee Benefit Plans - Asset Category and Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 49.1	$ 42.8	$ 48.5
Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	48.8	42.6
Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	0.3	0.2	$ 2.9
Equity funds
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 36.0	30.0
Equity funds | Minimum
Defined Benefit Plan Disclosure
Target Allocations by Asset Category	60.00%
Equity funds | Maximum
Defined Benefit Plan Disclosure
Target Allocations by Asset Category	70.00%
Equity funds | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 36.0	30.0
Equity funds | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Fixed income funds
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 12.8	12.6
Fixed income funds | Minimum
Defined Benefit Plan Disclosure
Target Allocations by Asset Category	26.00%
Fixed income funds | Maximum
Defined Benefit Plan Disclosure
Target Allocations by Asset Category	30.00%
Fixed income funds | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 12.8	12.6
Fixed income funds | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Other investments
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 0.3	0.2
Other investments | Minimum
Defined Benefit Plan Disclosure
Target Allocations by Asset Category	3.00%
Other investments | Maximum
Defined Benefit Plan Disclosure
Target Allocations by Asset Category	6.00%
Other investments | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 0.0	0.0
Other investments | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 0.3	$ 0.2

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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