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Employee Benefit Plans - Schedule of Plan Assets Using the Fair Value Hierarchy (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Plan assets using fair value hierarchy
Fair value of plan assets	$ 150.4	$ 340.8
Cash
Plan assets using fair value hierarchy
Fair value of plan assets	0.9	2.0
Insurance group annuity contracts
Plan assets using fair value hierarchy
Fair value of plan assets	14.5	106.5
Common/collective trust funds — Government debt
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	0.0
Common/collective trust funds — Corporate and other non-government debt
Plan assets using fair value hierarchy
Fair value of plan assets	38.4	60.6
Common/collective trust funds — Government, corporate and other non-government debt
Plan assets using fair value hierarchy
Fair value of plan assets	55.3	98.7
Common/collective trust funds — Corporate equity
Plan assets using fair value hierarchy
Fair value of plan assets	41.3	67.1
Common/collective trust funds — Customized strategy
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	5.9
Quoted Prices in Active Markets for Identical Assets (Level 1)
Plan assets using fair value hierarchy
Fair value of plan assets	0.9	2.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash
Plan assets using fair value hierarchy
Fair value of plan assets	0.9	2.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Insurance group annuity contracts
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust funds — Government debt
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust funds — Corporate and other non-government debt
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust funds — Government, corporate and other non-government debt
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust funds — Corporate equity
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust funds — Customized strategy
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	0.0
Significant Other Observable Inputs (Level 2)
Plan assets using fair value hierarchy
Fair value of plan assets	135.0	232.3
Significant Other Observable Inputs (Level 2) | Cash
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	0.0
Significant Other Observable Inputs (Level 2) | Insurance group annuity contracts
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	0.0
Significant Other Observable Inputs (Level 2) | Common/collective trust funds — Government debt
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	0.0
Significant Other Observable Inputs (Level 2) | Common/collective trust funds — Corporate and other non-government debt
Plan assets using fair value hierarchy
Fair value of plan assets	38.4	60.6
Significant Other Observable Inputs (Level 2) | Common/collective trust funds — Government, corporate and other non-government debt
Plan assets using fair value hierarchy
Fair value of plan assets	55.3	98.7
Significant Other Observable Inputs (Level 2) | Common/collective trust funds — Corporate equity
Plan assets using fair value hierarchy
Fair value of plan assets	41.3	67.1
Significant Other Observable Inputs (Level 2) | Common/collective trust funds — Customized strategy
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	5.9
Unobservable Inputs (Level 3)
Plan assets using fair value hierarchy
Fair value of plan assets	14.5	106.5
Unobservable Inputs (Level 3) | Cash
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	0.0
Unobservable Inputs (Level 3) | Insurance group annuity contracts
Plan assets using fair value hierarchy
Fair value of plan assets	14.5	106.5	$ 117.7
Unobservable Inputs (Level 3) | Common/collective trust funds — Government debt
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	0.0
Unobservable Inputs (Level 3) | Common/collective trust funds — Corporate and other non-government debt
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	0.0
Unobservable Inputs (Level 3) | Common/collective trust funds — Government, corporate and other non-government debt
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	0.0
Unobservable Inputs (Level 3) | Common/collective trust funds — Corporate equity
Plan assets using fair value hierarchy
Fair value of plan assets	0.0	0.0
Unobservable Inputs (Level 3) | Common/collective trust funds — Customized strategy
Plan assets using fair value hierarchy
Fair value of plan assets	$ 0.0	$ 0.0

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930

Reference 2: 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=65897934&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6749337

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6520858

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