Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Capital loss	$ 29.0	$ 0.0
Net operating losses and credit carryforward	9.3	3.4
Lease liabilities	7.7	6.8
Deferred compensation plans	6.7	5.9
Deferred income	5.5	4.8
Deferred liabilities	2.8	2.7
Allowance for uncollectible receivables	1.2	1.0
Deferred tax assets	62.2	24.6
Valuation allowance	(1.4)	(0.2)
Net deferred tax asset	60.8	24.4
Deferred tax liabilities:
Equity investments in excess of tax basis	121.6	114.8
Intangible assets in excess of tax basis	65.6	60.2
Property and equipment in excess of tax basis	77.9	53.4
Right-of-use assets	7.4	6.8
Other	2.2	2.0
Deferred tax liabilities	274.7	237.2
Net deferred tax liability	$ (213.9)	$ (212.8)