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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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Goodwill [Line Items]
Goodwill and intangible asset impairment		$ 0.0		$ 0.0
Acquisition of business				5.5
Amortization of intangible assets	$ 0.5		$ 0.0	$ 0.7	$ 0.2
Aspen
Goodwill [Line Items]
Acquisition of business	5.5
Intangible asset acquired	$ 7.1