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 classified as intangible assets, excluding goodwill, attributable to disposal group held for sale or disposed of.

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Intangible Assets - Amortization Expense - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Indefinite Lived Intangible Assets By Major Class [Line Items]
Amortization of intangible assets	$ 10.9	$ 15.4	$ 13.6
Finite-lived intangible assets, amortization expense, 2020	10.6
Finite-lived intangible assets, amortization expense, 2021	9.9
Finite-lived intangible assets, amortization expense, 2022	9.2
Finite-lived intangible assets, amortization expense, 2023	6.5
Finite-lived intangible assets, amortization expense, 2024	4.2
Assets Held-for-sale [Member]
Indefinite Lived Intangible Assets By Major Class [Line Items]
Amortization of intangible assets	2.0
Wholesale Fuel Supply Contracts/Rights [Member]
Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible assets, net	$ 2.1