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Share-based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		11 Months Ended	12 Months Ended
	Apr. 21, 2015	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation.
Capitalized software development costs		$ 2.6	$ 2.7
Amortization expense related to share based compensation		$ 2.4	2.5
Non-voting common interest units outstanding		15,340,683		15,340,683	15,394,426
Number of non-voting common interest units forfeited or repurchased		53,743
Class A
Share-based Compensation.
Expense recognized		$ 3.4	$ 5.5
2015 Management Incentive Plan | Class A
Share-based Compensation.
Granted (in shares)				576,693
Class A-2 profits interests and Class B interests | East MIP
Weighted-average assumptions used in estimating grant date fair values
Expected life (in years)		2 years 8 months 12 days	6 months
Weighted average risk free interest rate (as a percent)		0.72%	0.12%
Expected stock price volatility (as a percent)		47.00%	25.00%
Class A-2 profits interests | Maximum
Share-based Compensation.
Vesting period		4 years	4 years
Class B interests | East MIP
Share-based Compensation.
Amortization expense related to share based compensation		$ 0.3
Class B interests | East MIP | Time based vesting
Share-based Compensation.
Vesting period		4 years	4 years
Non-voting common interest units (ormerly Class B interests)
Share-based Compensation.
Additional expense recognized		$ 0.3
Unrecognized share-based compensation expense		$ 1.8		$ 1.8
Weighted average period for compensation expense expected to be recognized		1 year 9 months 18 days
Capitalized software development costs		$ 0.1
Non-voting common interest units (formerly Class A 2 profits interests)
Share-based Compensation.
Expense recognized		0.4	$ 0.4
Unrecognized share-based compensation expense		$ 1.7		$ 1.7
Weighted average period for compensation expense expected to be recognized		1 year 4 months 24 days
Activity
Outstanding (in shares)			6,069,007		6,069,007
Granted (in shares)			6,418
Repurchased (in shares)			(13,495)
Outstanding (in shares)			6,061,930			6,069,007
Weighted Average Fair Value
Outstanding (in dollars per share)			$ 6.82		$ 6.82
Granted (in dollars per share)			7.52
Forfeited (in dollars per share)			7.17
Outstanding (in dollars per share)			$ 6.82			$ 6.82
Weighted Average Remaining Life, outstanding
Weighted Average Remaining Life			2 years 3 months 7 days			2 years 6 months 15 days
Weighted average remaining contractual life, granted			3 years
Non-qualified stock options
Share-based Compensation.
Expense recognized		$ 1.2
Outstanding (in shares)		8,994,000
Forfeited or expired (in shares)		(625,000)
Outstanding (in shares)		8,369,000		8,369,000	8,994,000
Weighted Average Exercise Price Per Share
Outstanding (in dollars per share)		$ 19.00
Outstanding (in dollars per share)		$ 19.00		$ 19.00	$ 19.00
Weighted Average Remaining Life, outstanding
Weighted Average Remaining Life		9 years 18 days			9 years 3 months 15 days
Non-qualified stock options | 2015 Management Incentive Plan
Share-based Compensation.
Vesting period	4 years
Expiration period	10 years
Unrecognized share-based compensation expense		$ 19.2		$ 19.2
Weighted average period for compensation expense expected to be recognized		3 years 1 month 6 days
Weighted-average assumptions used in estimating grant date fair values
Expected life (in years)		6 years 3 months
Weighted average risk free interest rate (as a percent)		1.52%
Expected stock price volatility (as a percent)		30.00%
Expected dividend yield (as a percent)		5.05%
Weighted Average Fair Value
Granted (in dollars per share)		$ 3.02
Restricted stock units
Share-based Compensation.
Expense recognized		$ 1.6
Unrecognized share-based compensation expense		$ 17.2		$ 17.2
Weighted average period for compensation expense expected to be recognized		2 years 9 months 18 days
Activity
Outstanding (in shares)		984,466
Forfeited (in shares)		(115,869)
Outstanding (in shares)		868,597		868,597	984,466
Weighted Average Fair Value
Outstanding (in dollars per share)		$ 22.32
Forfeited (in dollars per share)		22.51
Outstanding (in dollars per share)		$ 22.30		$ 22.30	$ 22.32
Restricted stock units | 2015 Management Incentive Plan
Share-based Compensation.
Vesting period				4 years
Activity
Granted (in shares)				984,466

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Additions made to capitalized computer software costs during the period.

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For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average grant-date fair value of non-vested options forfeited.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Represents the additional expense recognized during the period arising from equity-based compensation arrangements.

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Number of non-voting common interest units forfeited or repurchased during the period.

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Number of non-voting common interest units outstanding related to former Class A-2 profits, interests, Class B and East MIP Class B interests that were reclassified into non-voting common interest units.

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Number of share options (or share units) repurchased during the period.

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Represents the weighted average remaining contractual term for option awards granted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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