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Commitments and Contingencies - Asbestos Damages Sought (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | $ 10.0 us-gaap_LossContingencyDamagesSoughtValue
Asbestos [Member] | Compensatory and Punitive Damages [Member] | Range 1 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | 0 us-gaap_LossContingencyDamagesSoughtValue / trs_DamagesSoughtRangeAxis = trs_Range1Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryAndPunitiveDamagesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Asbestos [Member] | Compensatory and Punitive Damages [Member] | Range 1 [Member] | Maximum [Member] |
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | 5.0 us-gaap_LossContingencyDamagesSoughtValue / trs_DamagesSoughtRangeAxis = trs_Range1Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryAndPunitiveDamagesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Asbestos [Member] | Compensatory and Punitive Damages [Member] | Range 2 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | 5.0 us-gaap_LossContingencyDamagesSoughtValue / trs_DamagesSoughtRangeAxis = trs_Range2Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryAndPunitiveDamagesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Asbestos [Member] | Compensatory and Punitive Damages [Member] | Range 2 [Member] | Maximum [Member] |
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | 10.0 us-gaap_LossContingencyDamagesSoughtValue / trs_DamagesSoughtRangeAxis = trs_Range2Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryAndPunitiveDamagesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Asbestos [Member] | Compensatory and Punitive Damages [Member] | Range 3 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | 10.0 us-gaap_LossContingencyDamagesSoughtValue / trs_DamagesSoughtRangeAxis = trs_Range3Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryAndPunitiveDamagesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Asbestos [Member] | Compensatory Only Damages [Member] | Range 1 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | 0 us-gaap_LossContingencyDamagesSoughtValue / trs_DamagesSoughtRangeAxis = trs_Range1Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryOnlyDamagesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Asbestos [Member] | Compensatory Only Damages [Member] | Range 1 [Member] | Maximum [Member] |
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | 0.6 us-gaap_LossContingencyDamagesSoughtValue / trs_DamagesSoughtRangeAxis = trs_Range1Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryOnlyDamagesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Asbestos [Member] | Compensatory Only Damages [Member] | Range 2 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | 0.6 us-gaap_LossContingencyDamagesSoughtValue / trs_DamagesSoughtRangeAxis = trs_Range2Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryOnlyDamagesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Asbestos [Member] | Compensatory Only Damages [Member] | Range 2 [Member] | Maximum [Member] |
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | 5.0 us-gaap_LossContingencyDamagesSoughtValue / trs_DamagesSoughtRangeAxis = trs_Range2Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryOnlyDamagesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Asbestos [Member] | Compensatory Only Damages [Member] | Range 3 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | 5.0 us-gaap_LossContingencyDamagesSoughtValue / trs_DamagesSoughtRangeAxis = trs_Range3Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryOnlyDamagesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Asbestos [Member] | Punitive Only Damages [Member] | Range 1 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | 0 us-gaap_LossContingencyDamagesSoughtValue / trs_DamagesSoughtRangeAxis = trs_Range1Member / trs_DamagesSoughtTypeAxis = trs_PunitiveOnlyDamagesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Asbestos [Member] | Punitive Only Damages [Member] | Range 1 [Member] | Maximum [Member] |
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | 2.5 us-gaap_LossContingencyDamagesSoughtValue / trs_DamagesSoughtRangeAxis = trs_Range1Member / trs_DamagesSoughtTypeAxis = trs_PunitiveOnlyDamagesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Asbestos [Member] | Punitive Only Damages [Member] | Range 2 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | 2.5 us-gaap_LossContingencyDamagesSoughtValue / trs_DamagesSoughtRangeAxis = trs_Range2Member / trs_DamagesSoughtTypeAxis = trs_PunitiveOnlyDamagesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Asbestos [Member] | Punitive Only Damages [Member] | Range 2 [Member] | Maximum [Member] |
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | 5.0 us-gaap_LossContingencyDamagesSoughtValue / trs_DamagesSoughtRangeAxis = trs_Range2Member / trs_DamagesSoughtTypeAxis = trs_PunitiveOnlyDamagesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Asbestos [Member] | Punitive Only Damages [Member] | Range 3 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified Amount of Damages Sought | $ 5.0 us-gaap_LossContingencyDamagesSoughtValue / trs_DamagesSoughtRangeAxis = trs_Range3Member / trs_DamagesSoughtTypeAxis = trs_PunitiveOnlyDamagesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Asbestos [Member] | Pending Litigation [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 126 trs_LossContingencyNumberofPlaintiffsSpecifyingDamagesSought / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Asbestos [Member] | Pending Litigation [Member] | Compensatory and Punitive Damages [Member] | Range 1 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 75 trs_LossContingencyNumberofPlaintiffsSpecifyingDamagesSought / trs_DamagesSoughtRangeAxis = trs_Range1Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryAndPunitiveDamagesMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Asbestos [Member] | Pending Litigation [Member] | Compensatory and Punitive Damages [Member] | Range 2 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 30 trs_LossContingencyNumberofPlaintiffsSpecifyingDamagesSought / trs_DamagesSoughtRangeAxis = trs_Range2Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryAndPunitiveDamagesMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Asbestos [Member] | Pending Litigation [Member] | Compensatory and Punitive Damages [Member] | Range 3 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 21 trs_LossContingencyNumberofPlaintiffsSpecifyingDamagesSought / trs_DamagesSoughtRangeAxis = trs_Range3Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryAndPunitiveDamagesMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Asbestos [Member] | Pending Litigation [Member] | Compensatory Only Damages [Member] | Range 1 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 22 trs_LossContingencyNumberofPlaintiffsSpecifyingDamagesSought / trs_DamagesSoughtRangeAxis = trs_Range1Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryOnlyDamagesMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Asbestos [Member] | Pending Litigation [Member] | Compensatory Only Damages [Member] | Range 2 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 58 trs_LossContingencyNumberofPlaintiffsSpecifyingDamagesSought / trs_DamagesSoughtRangeAxis = trs_Range2Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryOnlyDamagesMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Asbestos [Member] | Pending Litigation [Member] | Compensatory Only Damages [Member] | Range 3 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 46 trs_LossContingencyNumberofPlaintiffsSpecifyingDamagesSought / trs_DamagesSoughtRangeAxis = trs_Range3Member / trs_DamagesSoughtTypeAxis = trs_CompensatoryOnlyDamagesMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Asbestos [Member] | Pending Litigation [Member] | Punitive Only Damages [Member] | Range 1 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 120 trs_LossContingencyNumberofPlaintiffsSpecifyingDamagesSought / trs_DamagesSoughtRangeAxis = trs_Range1Member / trs_DamagesSoughtTypeAxis = trs_PunitiveOnlyDamagesMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Asbestos [Member] | Pending Litigation [Member] | Punitive Only Damages [Member] | Range 2 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 5 trs_LossContingencyNumberofPlaintiffsSpecifyingDamagesSought / trs_DamagesSoughtRangeAxis = trs_Range2Member / trs_DamagesSoughtTypeAxis = trs_PunitiveOnlyDamagesMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Asbestos [Member] | Pending Litigation [Member] | Punitive Only Damages [Member] | Range 3 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 1 trs_LossContingencyNumberofPlaintiffsSpecifyingDamagesSought / trs_DamagesSoughtRangeAxis = trs_Range3Member / trs_DamagesSoughtTypeAxis = trs_PunitiveOnlyDamagesMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember

X
- Definition Loss Contingency, Number of Plaintiffs Specifying Damages Sought + References No definition available. + Details
Name: | trs_LossContingencyNumberofPlaintiffsSpecifyingDamagesSought
Namespace Prefix: | trs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_AsbestosIssueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |