Unaudited Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Common Class A	Common Class A Common Stock	Common Class C	Common Class C Common Stock
Beginning Balance (shares) at Dec. 31, 2018		995
Beginning Balance at Dec. 31, 2018	$ 196.4	$ 0.0	$ 291.4	$ (69.9)	$ (1.5)	$ (23.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustments	(3.4)					(3.4)
Unrealized gain (loss) on interest rate swap, net of tax of $2.3	0.0
Net loss	$ (3.4)			(3.4)
Ending Balance (shares) at Mar. 31, 2019	995	995
Ending Balance at Mar. 31, 2019	$ 189.6	$ 0.0	291.4	(73.3)	$ (1.5)	(27.0)
Beginning Balance (shares) at Dec. 31, 2019							64,293,741	64,293,741	6,511,293	6,511,293
Beginning Balance at Dec. 31, 2019	531.8		557.5	(29.1)		3.4		$ 0.0		$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Additional Shares Purchased (shares)								51,603
Additional Shares Purchased	0.0							$ 0.0
Issue Director Shares (shares)								6,903
Issue Director Shares	0.0		0.0					$ 0.0
Amortization of restricted stock units	2.2		2.2
Foreign currency translation adjustments	(4.0)					(4.0)
Unrealized gain (loss) on interest rate swap, net of tax of $2.3	(7.8)					(7.8)
Net loss	$ (3.6)			(3.6)
Ending Balance (shares) at Mar. 31, 2020	70,863,540						64,352,247	64,352,247	6,511,293	6,511,293
Ending Balance at Mar. 31, 2020	$ 518.6		$ 559.7	$ (32.7)		$ (8.4)		$ 0.0		$ 0.0