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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Operating Loss Carryforwards
Tax benefit from changes in enacted taxes		$ 22.5
Provisional decrease of deferred tax liabilities		26.9
Provisional deemed repatriation transition tax		8.7				$ 8.7
One-time provisional tax benefit						26.9
Deferred foreign income tax adjustment	$ (0.6)			$ (0.6)
Income tax expense	$ 4.2		$ 0.7	$ 9.7	$ 0.6
Effective income tax rate (percent)	16.00%		100.00%	20.60%	120.00%
Effective federal statutory rate (percent)	21.00%		35.00%	21.00%
Liability for gross unrecognized tax benefits	$ 1.7	0.8		$ 1.7		0.8
Unrecognized tax benefit that would impact effective tax rate	0.8	0.6		0.8		0.6
Accrual for interest and penalties	0.2	0.1		$ 0.2		0.1
Hudson
Operating Loss Carryforwards
Provisional deemed repatriation transition tax	(1.4)	8.7				$ 8.7
Additional taxes related to proposed merger	$ 1.5	$ 4.5

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