Employee Benefit Plans and Other Postretirement Plans - Schedule of Weighted-Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Company contributions			$ 0.4	$ 30.0
Scenario, Forecast
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Expected return on plan assets	6.57%
Weighted-Average expected return on plan assets for 2016	6.57%
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Company contributions		$ 1.2	$ 1.3
Weighted-Average Assumptions Used to Determine Benefit Obligation, Discount Rate		4.51%	4.14%	5.00%
Weighted-Average Assumptions Used to Determine Benefit Obligations, Rate of compensation increase		4.00%	4.00%	4.00%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Discount rate		4.14%	5.00%	4.57%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Expected return on plan assets		6.73%	6.69%	6.53%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Rate of compensation increase		4.00%	4.00%	4.00%
Discount rate to calculate net periodic benefit cost for 2016		4.14%	5.00%	4.57%
Weighted-Average expected return on plan assets for 2016		6.73%	6.69%	6.53%
Postretirement Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Company contributions		$ 2.0	$ 1.3
Weighted-Average Assumptions Used to Determine Benefit Obligation, Discount Rate		4.35%	3.95%	4.85%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost, Discount rate		3.95%	4.85%	4.00%
Discount rate to calculate net periodic benefit cost for 2016		3.95%	4.85%	4.00%

The interest rate used to adjust for the time value of money for the plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ 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 (k)(2)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

The interest rate used to adjust for the time value of money.

+ References

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Expected Long-Term Rate of Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512046

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ 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 (k)(2)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ 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)(3)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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+ References

No definition available.

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