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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Amount of impairment loss from capitalized computer software costs.

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Goodwill and Other Intangibles - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization		$ 142.8	$ 145.8	$ 156.6
Impairment of intangible assets, finite-lived		21.0	$ 0.0	$ 0.0
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Asset impairment		$ 12.3
Technology-Based Intangible Assets and Trademarks
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets, finite-lived	$ 8.7