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Employee Benefit Plans - Summary of Changes in the Fair Value of Level 3 (Details) $ in Millions	Dec. 31, 2018 USD ($)
Changes in the fair value of Level 3 assets
Fair value of plan assets — beginning of year	$ 453.1
Fair value of plan assets — end of year	397.2
Global equity common trust funds
Changes in the fair value of Level 3 assets
Fair value of plan assets — beginning of year	50.6
Fair value of plan assets — end of year	41.1
Commingled global fund allocations
Changes in the fair value of Level 3 assets
Fair value of plan assets — beginning of year	95.1
Fair value of plan assets — end of year	83.3
Fixed income common trust funds
Changes in the fair value of Level 3 assets
Fair value of plan assets — beginning of year	270.2
Fair value of plan assets — end of year	228.5
Other
Changes in the fair value of Level 3 assets
Fair value of plan assets — beginning of year	1.0
Fair value of plan assets — end of year	1.0
Significant Unobservable Inputs (Level 3)
Changes in the fair value of Level 3 assets
Fair value of plan assets — beginning of year	1.0
Fair value of plan assets — end of year	1.0
Significant Unobservable Inputs (Level 3) | Global equity common trust funds
Changes in the fair value of Level 3 assets
Fair value of plan assets — beginning of year	0.0
Fair value of plan assets — end of year	0.0
Significant Unobservable Inputs (Level 3) | Commingled global fund allocations
Changes in the fair value of Level 3 assets
Fair value of plan assets — beginning of year	0.0
Fair value of plan assets — end of year	0.0
Significant Unobservable Inputs (Level 3) | Fixed income common trust funds
Changes in the fair value of Level 3 assets
Fair value of plan assets — beginning of year	0.0
Fair value of plan assets — end of year	0.0
Significant Unobservable Inputs (Level 3) | Other
Changes in the fair value of Level 3 assets
Fair value of plan assets — beginning of year	1.0
Fair value of plan assets — end of year	$ 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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X

- 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
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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