Income Taxes - Schedule of Deferred Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets
Net operating loss carryforwards	$ 71.6	$ 67.8
Capital loss carryforward	1.7	1.7
ASC 606 – revenue from contracts with customers	9.9	9.3
Tax credit carryforwards	8.6	8.1
Stock based compensation	7.7	8.4
Other comprehensive income	6.3	4.1
Reserves and other	13.3	15.6
Subtotal	119.1	115.0
Valuation allowance	(44.7)	(48.8)
Total assets	74.4	66.2
Liabilities
Accelerated depreciation	(189.1)	(163.0)
Accelerated amortization	(13.2)	(11.8)
Other	(6.0)	(4.0)
Total liabilities	(208.3)	(178.8)
Net deferred tax liabilities	$ (133.9)	$ (112.6)