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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted Average Remaining Useful Life (in Years) |  |  |  | 13 years 2 months 30 days |  | 13 years 6 months 40 days
Gross Carrying Amount |  | $ 435.1 |  | $ 435.1 |  | $ 333.5
Accumulated Amortization |  | 80.3 |  | 80.3 |  | $ 62.7
Intangible assets amortization expense |  | 6.3 | $ 5.7 | $ 17.5 | $ 17.1 |
Customer Relationships |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted Average Remaining Useful Life (in Years) |  |  |  | 13 years 3 months 30 days |  | 13 years 4 months
Gross Carrying Amount |  | 408.0 |  | $ 408.0 |  | $ 311.5
Accumulated Amortization |  | 73.2 |  | $ 73.2 |  | $ 57.3
Trademarks and Trade Names |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted Average Remaining Useful Life (in Years) |  |  |  | 11 years 8 months |  | 13 years 6 months 33 days
Gross Carrying Amount |  | 25.6 |  | $ 25.6 |  | $ 21.8
Accumulated Amortization |  | 6.9 |  | $ 6.9 |  | $ 5.2
Other Intangible Assets |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted Average Remaining Useful Life (in Years) |  |  |  | 2 years 10 months 30 days |  | 1 year 2 months 12 days
Gross Carrying Amount |  | 1.5 |  | $ 1.5 |  | $ 0.2
Accumulated Amortization |  | $ 0.2 |  | $ 0.2 |  | $ 0.2
TimBar Corporation | Customer Relationships |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite-lived intangible assets acquired | $ 96.5 |  |  |  |  |
TimBar Corporation | Trademarks and Trade Names |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite-lived intangible assets acquired | 3.8 |  |  |  |  |
TimBar Corporation | Other Intangible Assets |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite-lived intangible assets acquired | $ 1.3 |  |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: 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=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: 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=66006027&loc=d3e16323-109275 + Details
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