Goodwill and Intangible Assets Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived	$ 0.0	$ 0.0	$ 0.0
Amortization of Intangible Assets	$ 0.2	0.3	$ 0.4
Customer Relationships [Member] | Entertainment and Communications [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Gross Carrying Amount	$ 7.0	7.0
Accumulated Amortization	$ 7.0	$ 6.8