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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Inventories |  |
Percentage of the company's inventories valued using the first-in, first-out (FIFO) method | 84.00%us-gaap_PercentageOfFIFOInventory | 87.00%us-gaap_PercentageOfFIFOInventory
Increase in inventories if the FIFO inventory valuation method had been used exclusively | 36.2 us-gaap_ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue | $ 36.2 us-gaap_ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue
Engineering drawings |  |
Estimated useful lives of other intangible assets |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |
Minimum | Patents |  |
Estimated useful lives of other intangible assets |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |
Minimum | Customer relationships |  |
Estimated useful lives of other intangible assets |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |
Maximum | Patents |  |
Estimated useful lives of other intangible assets |  |
Finite-Lived Intangible Asset, Useful Life | 20 years |
Maximum | Customer relationships |  |
Estimated useful lives of other intangible assets |  |
Finite-Lived Intangible Asset, Useful Life | 20 years |

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