Equity-Based Compensation - RSU Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Additional disclosures
Equity-based compensation expense, net of forfeitures, attributable to future periods (in dollars)	$ 44.8
Employee and Non Employee Restricted Stock Units
Unvested Restricted Stock Units
Outstanding at beginning of year (in shares)	541,226
Granted (in shares)	411,429
Vested (in shares)	(149,572)
Forfeited (in shares)	(148,728)
Outstanding at end of year (in shares)	654,355	541,226
Outstanding at end of year and expected to vest (in shares)	567,954
Weighted Average Grant Date Fair Value
Outstanding at beginning of year (in dollars per share)	$ 20.62
Granted (in dollars per share)	52.71	$ 22.88	$ 16.31
Vested (in dollars per share)	23.56
Forfeited (in dollars per share)	34.78
Outstanding at end of year (in dollars per share)	36.90	$ 20.62
Outstanding at end of year and expected to vest (in dollars per share)	$ 36.85
Additional disclosures
Total grant date fair value	$ 3.5	$ 2.7	$ 2.8
Equity-based compensation expense, net of forfeitures, attributable to future periods (in dollars)	$ 16.6
Weighted average amortization periods	2 years
Employee and Non Employee Stock Option
Additional disclosures
Equity-based compensation expense, net of forfeitures, attributable to future periods (in dollars)	$ 28.2
Weighted average amortization periods	3 years