Retirement Plans - Information about Plan Assets (Details)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Fixed income securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Target plan asset allocations range, minimum	20.00%
Target plan asset allocations range, maximum	40.00%
Equity securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Target plan asset allocations range, minimum	35.00%
Target plan asset allocations range, maximum	80.00%
Other investments
Defined Benefit Plan, Information about Plan Assets [Abstract]
Target plan asset allocations range, minimum	10.00%
Target plan asset allocations range, maximum	20.00%
United States
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual plan asset allocations	100.00%	100.00%
United States \| Short-term investments
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual plan asset allocations	1.00%	1.00%
United States \| Fixed income securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual plan asset allocations	23.00%	18.00%
United States \| Equity securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual plan asset allocations	57.00%	63.00%
United States \| Other investments \| Absolute return strategy equity funds
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual plan asset allocations	19.00%	18.00%
United States \| Other investments \| Insurance contracts
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual plan asset allocations	0.00%	0.00%
International
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual plan asset allocations	100.00%	100.00%
International \| Short-term investments
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual plan asset allocations	1.00%	1.00%
International \| Fixed income securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual plan asset allocations	24.00%	23.00%
International \| Equity securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual plan asset allocations	0.00%	0.00%
International \| Other investments \| Absolute return strategy equity funds
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual plan asset allocations	0.00%	0.00%
International \| Other investments \| Insurance contracts
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual plan asset allocations	75.00%	76.00%

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Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ 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)(i)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920

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- Definition

Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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