Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Identifiable intangibles
Gross Carrying Amount	$ 167.0	$ 174.0
Accumulated Amortization	(52.0)	(45.0)
Net	$ 115.0	129.0
Finite-lived intangible asset, useful life	20 years
Amortization expense	$ 7.0	9.0	$ 7.0
Customer relationships
Identifiable intangibles
Gross Carrying Amount	127.0	132.0
Accumulated Amortization	(37.0)	(31.0)
Net	90.0	101.0
TerraCair brand
Identifiable intangibles
Gross Carrying Amount	10.0	10.0
Accumulated Amortization	(10.0)	(10.0)
Net	0.0	0.0
Trade names
Identifiable intangibles
Gross Carrying Amount	30.0	32.0
Accumulated Amortization	(5.0)	(4.0)
Net	$ 25.0	$ 28.0

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.

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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