Equity-Based Compensation (Details 2) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015
Restricted stock
Restricted stock and units
Outstanding at the beginning of the period (in shares)	161,476
Vested (in shares)	(155,475)
Unvested at the end of the period (in shares)	6,001
Expected to vest at the end of the period (in shares)	3,753
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 4.75
Vested (in dollars per share)	4.75
Unvested at the end of the period (in dollars per share)	4.75
Expected to vest at the end of the period (in dollars per share)	$ 4.75
Additional information
Intrinsic value of stock vested and repurchased	$ 4.1
Aggregate intrinsic value		$ 0.2
Unrecognized share-based compensation	$ 0.1
Weighted average remaining vesting term for options expected to vest	2 months 5 days
Restricted stock units
Restricted stock and units
Outstanding at the beginning of the period (in shares)	4,542,231
Granted (in shares)	1,840,624
Vested (in shares)	(1,114,485)
Forfeited/cancelled (in shares)	(353,032)
Unvested at the end of the period (in shares)	4,915,338
Expected to vest at the end of the period (in shares)	3,629,795
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 17.67
Granted (in dollars per share)	33.67
Vested (in dollars per share)	17.00
Forfeited/cancelled (in dollars per share)	22.15
Unvested at the end of the period (in dollars per share)	23.62
Expected to vest at the end of the period (in dollars per share)	$ 24.10
Additional information
Intrinsic value of stock vested	$ 35.4
Aggregate intrinsic value	172.3
Unrecognized share-based compensation	$ 60.7
Weighted average remaining vesting term for options expected to vest	1 year 7 months 24 days