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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 businessunit | Dec. 31, 2011 | Dec. 31, 2010
Foreign Currency Translation |  |  |
Foreign currency transaction gains and losses | $ 12.4 | $ 41.4 | $ 27.5
Revenue Recognition |  |  |
Number of business units in which sales incentive programs are significant | 1 |  |
Revenues recognized under percentage of completion method | 1,594.7 | 1,457.5 | 1,319.0
Costs and estimated earnings on uncompleted contracts |  |  |
Costs incurred on uncompleted contracts | 3,363.0 | 2,783.5 |
Estimated earnings to date | 804.8 | 750.6 |
Aggregate costs incurred on uncompleted contracts and estimated earnings to date | 4,167.8 | 3,534.1 |
Less: Billings to date | (4,066.7) | (3,514.4) |
"Net costs and estimated earnings in excess of billings after the acquisition of Clyde Union (Holdings) S.A.R.L. (""Clyde Union"")" | 101.1 | 19.7 |
Net costs and estimated earnings in excess of billings assumed in the acquisition of Clyde Union (Holdings) S.A.R.L. ("Clyde Union") | 10.0 | 57.2 |
Net costs and estimated earnings in excess of billings | 111.1 | 76.9 |
Billings in excess of costs and estimated earnings |  |  |
Costs and estimated earnings in excess of billings | 359.7 | 355.9 |
Billings in excess of costs and estimated earnings on uncompleted contracts | (248.6) | (279.0) |
Net costs and estimated earnings in excess of billings | 111.1 | 76.9 |
Billings in excess of costs and estimated earnings on uncompleted contracts reported as a component of accrued expenses | 248.4 | 275.4 |
Billings in excess of costs and estimated earnings on uncompleted contracts reported as a component of other long-term liabilities | 0.2 | 3.6 |
Research and Development Costs |  |  |
Research and development expense | 53.4 | 52.7 | 47.2
Property, plant and equipment |  |  |
Depreciation expense | 76.0 | 64.3 | 62.4
Interest capitalized | $ 0.5 | $ 1.3 | $ 3.9
Building |  |  |
Property, plant and equipment |  |  |
Useful lives of property, plant and equipment, high end of range (in years) | 40.0 |  |
Machinery and equipment |  |  |
Property, plant and equipment |  |  |
Useful lives of property, plant and equipment, low end of range (in years) | 3.0 |  |
Useful lives of property, plant and equipment, high end of range (in years) | 15.0 |  |

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