Equity Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity compensation expense	$ 4.3	$ 9.7
Stock appreciation rights granted	300,000
Stock appreciation rights granted, weighted average exercise price (per share)	$ 78.48
Performance contingent units	200,000
Shares Granted To Non Employee Directors	15,925
Options exercisable (shares)	1,900,000
Options exercisable, weighted average price (per share)	$ 50.84
Options, remaining term	5 years 4 months 24 days
Compensation cost not yet recognized	$ 43.9
Period for recognition	2 years 4 months