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Property, Plant and Equipment | 12 Months Ended
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Jun. 30, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Property, plant and equipment consisted of the following components at June 30, 2018 and 2017:
|  | June 30,
($ in millions) |  | 2018 |  | 2017
Land |  | $ | 34.8 |  |  | $ | 34.1 |
Buildings and building equipment |  | 500.0 |  |  | 495.7 |
Machinery and equipment |  | 2,129.0 |  |  | 2,082.4 |
Construction in progress |  | 83.6 |  |  | 56.3 |
Total at cost |  | 2,747.4 |  |  | 2,668.5 |
Less: accumulated depreciation and amortization |  | 1,434.0 |  |  | 1,351.7 |
Total property, plant, and equipment |  | $ | 1,313.4 |  |  | $ | 1,316.8 |
The estimated useful lives of depreciable assets are as follows:
Asset Category |  | Useful Life (in Years)
Buildings and building equipment |  | 10 – 45
Machinery and equipment |  | 3 – 30
As a result of the prolonged weakness in oil and gas drilling and exploration activities and the impact this weakness had on certain reporting units in the PEP segment, the Company recorded an impairment charge related to property, plant and equipment of $6.5 million during fiscal year 2016. Depreciation for the years ended June 30, 2018, 2017 and 2016 was $104.7 million, $105.8 million and $106.5 million, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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