Equity Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity compensation expense	$ 3.1	$ 6.4
Stock appreciation rights granted	300,000
Stock appreciation rights granted, weighted average exercise price (per share)	$ 90.06
Performance contingent units	200,000
Shares Granted To Non Employee Directors	15,174
Options exercisable (shares)	1,800,000
Options exercisable, weighted average price (per share)	$ 53.26
Options, remaining term	4 years 11 months
Compensation cost not yet recognized	$ 36.6
Period for recognition	2 years 1 month