Equity Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity compensation expense	$ 7.4	$ 3.1
Stock appreciation rights granted	300,000
Stock appreciation rights granted, weighted average exercise price (per share)	$ 93.53
Performance contingent units	200,000
Shares Granted To Non Employee Directors	8,908
Options exercisable (shares)	1,800,000
Options exercisable, weighted average price (per share)	$ 56.13
Options, remaining term	4 years 8 months
Compensation cost not yet recognized	$ 40.7
Period for recognition	2 years 1 month