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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-Publisher FASB
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-Topic 230
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Amount of increase (decrease) in carrying value of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Goodwill and Intangible Assets - Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Intangible assets amortization expense		$ 42.9	$ 38.6	$ 40.5
2021		37.3
2022		34.9
2023		33.9
2024		33.4
2025		33.2
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Adjustment to decrease the remaining book value of intangible asset	$ 4.5	$ 4.5	$ 0.7