Equity-Based Compensation - Stock Options and Stock Appreciation Rights (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Shares
End of Period (in shares)	0
Employee Stock Option
Shares
Beginning of Period (in shares)	0
End of Period (in shares)		0
Stock Options and SARs
Shares
Beginning of Period (in shares)	1,206,000	1,861,000
Exercised (in shares)	(227,000)	(398,000)
Forfeited or Expired (in shares)	(24,000)	(257,000)
End of Period (in shares)	955,000	1,206,000
Weighted-Average Exercise Price
Beginning of Period (in USD per share)	$ 76.29	$ 74.12
Exercised (in USD per share)	70.59	62.63
Forfeited or Expired (in USD per share)	81.71	81.71
End of Period (in USD per share)	$ 77.52	$ 76.29
Weighted average contractual term of options outstanding	8 months 12 days
Total Intrinsic Value	$ 2.6
Stock Appreciation Rights (SARs)
Shares
Beginning of Period (in shares)	955
End of Period (in shares)		955