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Intangible Assets | 6 Months Ended
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Jun. 30, 2014
Intangible Assets Disclosure [Abstract] |
Intangible Assets Disclosure [Text Block] | Intangible Assets The gross carrying amount and accumulated amortization for intangible assets consisted of the following ($ in millions):
| June 30, 2014 |  | December 31, 2013
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Amortized intangible assets |  |  |  |  |  |  |  |  |  |  |
Customer Relationships (Filtration) | 45.3 |  |  | 1.1 |  |  | 44.2 |  |  | 45.3 |  |  | 0.1 |  |  | 45.2 |
Developed Technology (Filtration) | 13.8 |  |  | 0.6 |  |  | 13.2 |  |  | 13.8 |  |  | 0.1 |  |  | 13.7 |
Total | $ | 59.1 |  |  | $ | 1.7 |  |  | $ | 57.4 |  |  | $ | 59.1 |  |  | $ | 0.2 |  |  | $ | 58.9 |
Unamortized intangible assets (Filtration) |  |  |  |  |  |  |  |
Trade names | $ | 21.8 |  |  |  |  |  |  | $ | 21.8 |  |  |  |  |
Amortization expense of intangible assets was $0.7 million and $0.1 million for the three months ended June 30, 2014 and 2013, respectively, and $1.5 million and $0.2 million for the six months ended June 30, 2014 and 2013, respectively. Finite-lived intangibles in the Filtration segment are expensed using the straight-line amortization method. The estimated aggregate amortization expense is $3.1 million in each of the next five years.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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