Retirement Plans - Pension Plan Asset Allocation (Details 7) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Retirement Plans
Target allocations	100.00%
Percentage of plan assets	100.00%	100.00%
Equity Securities [Member]
Retirement Plans
Target allocations	60.00%
Percentage of plan assets	60.00%	67.00%
Equity Securities [Member] \| Common Stock [Member]
Retirement Plans
Percentage of plan assets	8.00%	9.00%
CTS common stock included in pension plan assets, Amount	26,000,000	29,000,000
Debt Securities [Member]
Retirement Plans
Target allocations	25.00%
Percentage of plan assets	25.00%	20.00%
Other [Member]
Retirement Plans
Target allocations	15.00%
Percentage of plan assets	15.00%	13.00%

The amount of employer securities or securities of parties related to the employer that are included in plan assets.

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- Details

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- Definition

Target allocation 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

+ Details

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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

+ Details

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- Details

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