Equity Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity compensation expense	$ 5.5	$ 3.7
Stock appreciation rights granted	700,000
Stock appreciation rights granted, weighted average exercise price (per share)	$ 58.77
Performance contingent units	300,000
Shares Granted To Non Employee Directors	14,200
Options exercisable (shares)	1,700,000
Options exercisable, weighted average price (per share)	$ 50.57
Options, remaining term	4 years 11 months 6 days
Compensation cost not yet recognized	$ 32.7
Period for recognition	2 years 1 month 12 days