Significant Accounting Policies and Practices - Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2014	Mar. 31, 2018 USD ($)	Dec. 31, 2020 USD ($) partnership variable_interest_entity voting_interest_model_entity	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 03, 2018 USD ($)
Significant Accounting Policies and Practices
Restricted cash and cash equivalents			$ 0.3	$ 0.5
Allowance for doubtful accounts			5.1	1.9	$ 1.0
Book overdrafts			$ 23.2	29.3
Number of ownership interest entities | partnership			29
Equity earnings in related investments			$ 1.3	$ 3.2	$ 2.7
ASU 2016-13
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted [true false]			true
Change in accounting principle, accounting standards update, immaterial effect			true
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2020
ASU 2017-04
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted [true false]			true
Change in accounting principle, accounting standards update, immaterial effect			true
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2020
ASU 2018-13
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted [true false]			true
Change in accounting principle, accounting standards update, immaterial effect			true
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2020
ASU 2018-15
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted [true false]			true
Change in accounting principle, accounting standards update, immaterial effect			true
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2020
ASU 2018-17
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted [true false]			true
Change in accounting principle, accounting standards update, immaterial effect			true
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2020
ASU 2018-18
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted [true false]			true
Change in accounting principle, accounting standards update, immaterial effect			true
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2020
ASU 2018-19
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted [true false]			true
Change in accounting principle, accounting standards update, immaterial effect			true
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2020
ASU 2019-04
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted [true false]			true
Change in accounting principle, accounting standards update, immaterial effect			true
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2020
ASU 2019-08
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted [true false]			true
Change in accounting principle, accounting standards update, immaterial effect			true
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2020
ASU 2020-02
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted [true false]			true
Change in accounting principle, accounting standards update, immaterial effect			true
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2020
ASU 2019-12
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted [true false]			true
Change in accounting principle, accounting standards update, immaterial effect			true
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2020
Discontinued Operations, Disposed of by Sale | Parkmobile
Significant Accounting Policies and Practices
Sale price of business						$ 19.0
Gain on sale of business		$ 10.1
Parkmobile, LLC
Significant Accounting Policies and Practices
Ownership percentage (in percentage)	30.00%
Primary Beneficiary
Significant Accounting Policies and Practices
Number of ownership interest entities | variable_interest_entity			24
Not Primary Beneficiary
Significant Accounting Policies and Practices
Number of ownership interest entities | voting_interest_model_entity			5
Minimum
Significant Accounting Policies and Practices
Ownership interests percentage			30.00%
Maximum
Significant Accounting Policies and Practices
Ownership interests percentage			50.00%
Equipment | Minimum
Significant Accounting Policies and Practices
Ranges of estimated useful life			1 year
Equipment | Maximum
Significant Accounting Policies and Practices
Ranges of estimated useful life			10 years
Leasehold improvements | Maximum
Significant Accounting Policies and Practices
Ranges of estimated useful life			10 years
Leasehold improvements | Average
Significant Accounting Policies and Practices
Ranges of estimated useful life			4 years 3 months 18 days