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Summary of Significant Accounting Policies (Details 3) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 item | Dec. 31, 2012 | Dec. 31, 2011
Foreign Currency Translation and Transactions |  |  |
Foreign currency transaction (gain) loss | $ 15.6 | $ 12.4 | $ 41.4
Revenue Recognition |  |  |
Number of business units in which sales incentive programs are significant | 1 |  |
Revenues recognized under percentage of completion method | 1,343.8 | 1,594.7 | 1,457.5
Costs and estimated earnings on uncompleted contracts |  |  |
Costs incurred on uncompleted contracts | 3,767.4 | 3,363.0 |
Estimated earnings to date | 813.2 | 804.8 |
Aggregate costs incurred on uncompleted contracts and estimated earnings to date | 4,580.6 | 4,167.8 |
Less: Billings to date | (4,517.9) | (4,066.7) |
Net costs and estimated earnings in excess of billings after the acquisition of Clyde Union (Holdings) S.A.R.L. ("Clyde Union") | 62.7 | 101.1 |
Net costs and estimated earnings in excess of billings assumed in the acquisition of Clyde Union (Holdings) S.A.R.L. ("Clyde Union") | 4.2 | 10.0 |
Net costs and estimated earnings in excess of billings | 66.9 | 111.1 |
Billings in excess of costs and estimated earnings |  |  |
Costs and estimated earnings in excess of billings | 285.3 | 359.7 |
Billings in excess of costs and estimated earnings on uncompleted contracts | (218.4) | (248.6) |
Net costs and estimated earnings in excess of billings | 66.9 | 111.1 |
Research and Development Costs |  |  |
Research and development expense | 44.7 | 46.0 | 41.1
Property, plant and equipment |  |  |
Depreciation expense, including amortization of capital leases | 81.8 | 73.5 | 59.9
Interest capitalized | $ 0 | $ 0.5 | $ 1.3
Minimum |  |  |
Property, plant and equipment |  |  |
Period for receivables to be collected which are not significant | 1 year |  |
Building | Maximum |  |  |
Property, plant and equipment |  |  |
Useful lives of property, plant and equipment (in years) | 40 years |  |
Machinery and equipment | Minimum |  |  |
Property, plant and equipment |  |  |
Useful lives of property, plant and equipment (in years) | 3 years |  |
Machinery and equipment | Maximum |  |  |
Property, plant and equipment |  |  |
Useful lives of property, plant and equipment (in years) | 15 years |  |

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- Definition The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 30 -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. + Details
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