Business Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue	$ 299.2	$ 285.8	$ 588.1	$ 578.7
Operating income (loss)	27.4	29.7	57.0	66.8
Expenditures for long-lived assets	59.2	74.6	121.6	132.5
Depreciation and amortization	44.8	34.0	88.2	66.6
Assets	1,423.2		1,423.2		$ 1,446.4
Entertainment and Communications [Member]
Segment Reporting Information [Line Items]
Revenue	192.5	182.4	382.8	370.5
Operating income (loss)	27.2	30.1	54.9	71.4
Expenditures for long-lived assets	55.3	70.1	115.6	124.1
Depreciation and amortization	41.6	31.0	81.8	60.5
Assets	1,030.3		1,030.3		982.5
IT Services and Hardware [Member]
Segment Reporting Information [Line Items]
Revenue	109.8	106.3	212.3	213.9
Operating income (loss)	6.9	6.2	14.1	7.3
Expenditures for long-lived assets	3.8	4.4	5.8	8.3
Depreciation and amortization	3.2	3.0	6.4	6.1
Assets	59.2		59.2		58.0
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(6.7)	(6.6)	(12.0)	(11.9)
Expenditures for long-lived assets	0.1	0.1	0.2	0.1
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Revenue	(3.1)	(2.9)	(7.0)	(5.7)
Intersegment Elimination [Member] | Entertainment and Communications [Member]
Segment Reporting Information [Line Items]
Revenue	0.2	0.4	0.6	0.7
Intersegment Elimination [Member] | IT Services and Hardware [Member]
Segment Reporting Information [Line Items]
Revenue	2.9	2.5	6.4	5.0
Intersegment Elimination [Member] | Corporate Segment [Member]
Segment Reporting Information [Line Items]
Assets	333.7		333.7		$ 405.9
Sales [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Revenue	$ 3.1	$ 2.9	$ 7.0	$ 5.7