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Equity Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity compensation expense	$ 28.4	$ 17.1
Stock appreciation rights granted	200,000
Stock appreciation rights granted, weighted average exercise price (per share)	$ 150.87
Performance contingent units	100,000
Shares Granted To Non Employee Directors	7,623
Options exercisable (shares)	1,500,000
Options exercisable, weighted average price (per share)	$ 66.48
Options, remaining term	4 years 3 months
Compensation cost not yet recognized	$ 35.1
Period for recognition	1 year 3 months

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Unrecognized cost of unvested share-based compensation awards.

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