Stock-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Compensation expense [Abstract]
Stock-based compensation cost	$ 7.4	$ 4.9	$ 4.0
Stock Options [Member]
Compensation expense [Abstract]
Stock-based compensation cost	1.1	0.9	0.9
Total fair value of stock options vesting	1.0	$ 0.9	$ 0.9
Unrecognized compensation costs	$ 2.1
Weighted average period recognized	2 years 6 months
Assumptions for stock awards granted [Abstract]
Weighted-average fair value of options (in dollars per share)	$ 4.60	$ 7.11	$ 10.21
Expected life of awards in years	6 years 4 months 24 days	6 years 3 months 18 days	6 years 3 months 18 days
Risk-free interest rate	1.40%	1.90%	2.10%
Expected volatility of the Company's stock	45.50%	66.90%	76.10%
Expected dividend yield on the Company's stock	0.00%	0.00%	0.00%
Annual vesting percentage	25.00%
Award performance period	4 years
Pre-vesting forfeiture rate	2.50%
Stock options activity [Rollforward]
Outstanding, beginning (in shares)	1.5
Granted (in shares)	0.3
Exercised (in shares)	(0.1)
Forfeited or expired (in shares)	(0.2)
Outstanding, ending (in shares)	1.5	1.5
Exercisable, ending (in shares)	1.0
Weighted average exercise price [Rollforward]
Outstanding, beginning (in dollars per share)	$ 10.82
Granted (in dollars per share)	10.00
Exercised (in dollars per share)	9.23
Forfeited or expired (in dollars per share)	21.76
Outstanding, ending (in dollars per share)	9.83	$ 10.82
Exercisable, March 31 (in dollars per share)	$ 9.27
Summary of stock option activity [Abstract]
Options, Outstanding, Weighted average remaining contractual term	5 years 6 months
Options, Outstanding, Aggregate intrinsic value	$ 4.4
Options, Exercisable, Weighted average remaining contractual term	4 years
Options, Exercisable, Aggregate intrinsic value	$ 3.6
Additional information related to stock options exercised [Abstract]
Intrinsic value of stock options exercised	0.5	$ 0.4	$ 0.4
Proceeds from stock options exercised	$ 0.9	0.5	0.6
Stock Options [Member] \| Maximum [Member]
Assumptions for stock awards granted [Abstract]
Stock option term	10 years
Restricted Stock [Member]
Compensation expense [Abstract]
Stock-based compensation cost	$ 3.8	3.5	2.8
Total fair value of stock options vesting	4.0	$ 3.4	2.3
Unrecognized compensation costs	$ 4.8
Weighted average period recognized	2 years 4 months 24 days
Assumptions for stock awards granted [Abstract]
Annual vesting percentage	25.00%
Award performance period	4 years
Restricted stock activity [Roll Forward]
Non-vested balance, beginning (in shares)	0.6
Granted (in shares)	0.4
Vested (in shares)	(0.4)
Non-vested balance, ending (in shares)	0.6	0.6
Weighted average price [Rollforward]
Non-vested balance, beginning (in dollars per share)	$ 11.29
Granted (in dollars per share)	9.98
Vested (in dollars per share)	10.05
Non-vested balance, ending (in dollars per share)	$ 11.21	$ 11.29
Restricted Stock - Performance Based Shares [Member]
Compensation expense [Abstract]
Stock-based compensation cost	$ 2.5	$ 0.5	$ 0.3
Unrecognized compensation costs	$ 3.2
Weighted average period recognized	1 year 9 months 18 days
Assumptions for stock awards granted [Abstract]
Award performance period	3 years	3 years	3 years
2008 Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	1.6

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Pre-vesting forfeiture rate assumption used in estimating the expected forfeitures.

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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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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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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 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 weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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Weighted average price of options that were either forfeited or 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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Percentage of vesting of share-based compensation awards.

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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 remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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

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