Related Party Transactions (Other Related Party Transactions) (Narrative) (Details) - Executive Officers [Member] - Related Customer [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Employee Leasing Arrangements [Member]
Related Party Transaction [Line Items]
Charges to related party	$ 0.2	$ 0.2	$ 0.4	$ 0.3
Due from related party	0.1		0.1		$ 0.1
Satellite Communication Services [Member]
Related Party Transaction [Line Items]
Revenue from related party	0.2	$ 0.2	0.4	$ 0.5
Accounts receivable, related party	$ 0.3		$ 0.3		$ 0.5