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Goodwill and Intangible Assets, Identifiable Intangible Table (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 years | Dec. 31, 2010 years | Dec. 31, 2011 Customer Relationships [Member] years | Dec. 31, 2010 Customer Relationships [Member] years | Dec. 31, 2011 Backlog [Member] years | Dec. 31, 2010 Backlog [Member] years | Dec. 31, 2011 Trademark and trade name [Member] years | Jan. 03, 2011 Alexco
Identifiable intangible assets |  |  |  |  |  |  |  |
Weighted average estimated useful life | 24 | 18 | 25 | 20 | 2 | 3 | 3 |
Original cost | $ 39.7 | $ 4.3 | $ 38.5 | $ 3.8 | $ 0.8 | $ 0.5 | $ 0.4 |
Accumulated amortization | (2.5) | (0.3) | (1.7) | (0.1) | (0.7) | (0.2) | (0.1) |
Net book value | 37.2 | 4.0 | 36.8 | 3.7 | 0.1 | 0.3 | 0.3 |
Acquired Finite-lived Intangible Asset, Amount |  |  |  |  |  |  |  | $ 35.4

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- Definition The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275 + Details
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- Definition The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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