Business Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue	$ 288.9	$ 292.9
Operating income (loss)	29.6	37.1
Expenditures for long-lived assets	62.4	57.9
Depreciation and amortization	43.4	32.6
Assets	1,444.6		$ 1,446.4
Entertainment and Communications [Member]
Segment Reporting Information [Line Items]
Revenue	190.3	188.1
Operating income (loss)	27.7	41.3
Expenditures for long-lived assets	60.3	54.0
Depreciation and amortization	40.2	29.5
Assets	1,004.4		982.5
IT Services and Hardware [Member]
Segment Reporting Information [Line Items]
Revenue	102.5	107.6
Operating income (loss)	7.2	1.1
Expenditures for long-lived assets	2.0	3.9
Depreciation and amortization	3.2	3.1
Assets	57.5		58.0
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(5.3)	(5.3)
Expenditures for long-lived assets	0.1	0.0
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Revenue	(3.9)	(2.8)
Intersegment Elimination [Member] | Entertainment and Communications [Member]
Segment Reporting Information [Line Items]
Revenue	0.4	0.3
Intersegment Elimination [Member] | IT Services and Hardware [Member]
Segment Reporting Information [Line Items]
Revenue	3.5	2.5
Intersegment Elimination [Member] | Corporate Segment [Member]
Segment Reporting Information [Line Items]
Assets	382.7		$ 405.9
Sales [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Revenue	3.9	2.8
Continuing Operations [Member]
Segment Reporting Information [Line Items]
Expenditures for long-lived assets	62.4	57.9
Depreciation and amortization	$ 43.4	$ 32.6