Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Gross goodwill	$ 8,000.0		$ 8,000.0		$ 8,400.0
Accumulated impairment loss	1,900.0		1,900.0		$ 2,200.0
Amortization expense of intangible assets	$ 51.8	$ 54.0	$ 157.3	$ 163.3

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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