Stock-Based Compensation and Employee Benefit Plans (Options) (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation cost for nonvested option awards not yet recognized	$ 20.5
Weighted-average recognition period	2 years 9 months 22 days
Aggregate intrinsic value	$ 10.8	$ 12.1	$ 1.0