Long-Term Incentive Plan (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Assumptions:
Vesting period	3 years
Aggregate disclosure
Unamortized compensation expense related to nonvested Series B units	$ 91.5
2017 LTIP
Aggregate disclosure
Number of common shares may be delivered pursuant to awards, subject to customary adjustments | shares	930,851
Series B unit awards
Assumptions:
Floor equity value	$ 2,000.0
Expected volatility (as a percent)	43.00%
Risk free rate (as a percent)	2.45%
Weighted average cost of capital (as a percent)	7.25%
Estimated value (in dollars per unit) | $ / shares	$ 998.72
Aggregate disclosure
Expense recognized	$ 8.3
Expense recognized as equity awards	7.7
Expense recognized as liability awards	$ 0.6
Weighted average period for recognizing unrecognized stock-based compensation expense	2 years 9 months
IDR LLC
Long-Term Incentive Plan
Authorized Series B units | shares	100,000
Outstanding Series B units | shares	100,000
Percentage of amount of quarterly distribution in excess of threshold limit	6.00%
Threshold limit for quarterly distribution	$ 7.5
IDR LLC | Maximum
Long-Term Incentive Plan
Percentage of amount of quarterly distribution in excess of threshold limit	6.00%
Percentage of amount of equity value in excess of threshold limit for conversion of units to common shares	6.00%
Threshold limit for conversion of units to common shares	$ 2,000.0