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Current Expected Credit Losses - Changes in the Allowance for Credit Losses (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2020	$ 23.1
Bad debt (credit) expense for the three months ended March 31, 2021	(2.0)
Advertising provision adjustment	(1.4)
Write-offs	(1.4)
Recoveries	0.0
Balance, March 31, 2021	18.3
Accounts Receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2020	11.2
Bad debt (credit) expense for the three months ended March 31, 2021	(2.0)
Advertising provision adjustment	(1.4)
Write-offs	(0.2)
Recoveries	0.0
Balance, March 31, 2021	7.6
Notes receivable, short-term
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2020	3.6
Bad debt (credit) expense for the three months ended March 31, 2021	0.5
Advertising provision adjustment	(0.0)
Write-offs	0.0
Recoveries	0.0
Balance, March 31, 2021	4.1
Notes receivable, long-term
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2020	5.3
Bad debt (credit) expense for the three months ended March 31, 2021	(0.0)
Advertising provision adjustment	0.0
Write-offs	0.0
Recoveries	0.0
Balance, March 31, 2021	5.3
Lease Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2020	0.4
Bad debt (credit) expense for the three months ended March 31, 2021	(0.3)
Advertising provision adjustment	0.0
Write-offs	0.0
Recoveries	0.0
Balance, March 31, 2021	0.1
Equipment Notes
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2020	2.3
Bad debt (credit) expense for the three months ended March 31, 2021	(0.1)
Advertising provision adjustment	0.0
Write-offs	(1.2)
Recoveries	0.0
Balance, March 31, 2021	1.0
Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, December 31, 2020	0.3
Bad debt (credit) expense for the three months ended March 31, 2021	(0.1)
Advertising provision adjustment	0.0
Write-offs	0.0
Recoveries	0.0
Balance, March 31, 2021	$ 0.2

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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