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Employee Benefit Plans - Summary of Changes in the Fair Value of Level 3 (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Changes in the fair value of Level 3 assets
Fair value of plan assets — beginning of year	$ 1.0	$ 1.0
Transfer from Level 3 to Level 2 assets	0.0	0.0
Sales	0.0	0.0
Fair value of plan assets — end of year	1.0	1.0
Global equity common trust funds
Changes in the fair value of Level 3 assets
Fair value of plan assets — beginning of year	0.0	0.0
Transfer from Level 3 to Level 2 assets	0.0	0.0
Sales	0.0	0.0
Fair value of plan assets — end of year	0.0	0.0
Commingled global fund allocation
Changes in the fair value of Level 3 assets
Fair value of plan assets — beginning of year	0.0	0.0
Transfer from Level 3 to Level 2 assets	0.0	0.0
Sales	0.0	0.0
Fair value of plan assets — end of year	0.0	0.0
Fixed income common trust funds
Changes in the fair value of Level 3 assets
Fair value of plan assets — beginning of year	0.0	0.0
Transfer from Level 3 to Level 2 assets	0.0	0.0
Sales	0.0	0.0
Fair value of plan assets — end of year	0.0	0.0
Other
Changes in the fair value of Level 3 assets
Fair value of plan assets — beginning of year	1.0	1.0
Transfer from Level 3 to Level 2 assets	0.0	0.0
Sales	0.0	0.0
Fair value of plan assets — end of year	$ 1.0	$ 1.0

X

- Definition

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

+ References

No definition available.

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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from purchases, sales and settlements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(iv)(02)(B)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan, for assets transferred into (out of) Level 3 of fair value hierarchy. Includes, but is not limited to, transfer due to change in observability of significant inputs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(iv)(02)(C)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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