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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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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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Indefinite-lived Intangible Assets
Accumulated goodwill impairment losses	$ 46.6		$ 46.6		$ 46.6
Amortization of expense of intangible assets	28.4		56.8	$ 56.9
Tradenames
Indefinite-lived Intangible Assets
Finite lived intangible asset useful life		15 years
Tradenames
Indefinite-lived Intangible Assets
Indefinite lived intangible assets	$ 105.0		$ 105.0		$ 150.0