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Percentage of the value of the incentive plan in earned cash.

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Percentage of the value of the incentive plan in restriced shares.

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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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Number of shares issued pursuant to the terms of a deferred compensation arrangement.

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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 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 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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Equity Awards - Restricted Shares Narrative (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted	356,413
Unrecognized Compensation Cost	$ 6,900,000
Period for Recognition of Share-based Compensation Cost Not yet Recognized	1 year 11 months
Restricted shares-based compensation expense	7,400,000	9,200,000	9,300,000
Restricted Shares [Member] \| Non-employee independent director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued related to director fee deferrals	10,140	5,215	7,979
Plan 2 [Member] \| Service-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted	40,837	41,480	60,665
Award requisite service period	1 year
Cash value of incentive plan	80.00%
Restriced shares value of incentive plan	20.00%
Plan 3 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance metrics in restricted shares award type plan	2			2
Plan 3 [Member] \| Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted				243,124	238,808	206,064
Plan 3 [Member] \| Service-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted	103,032
Award requisite service period	3 years			3 years
Plan 3 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted	103,032
Award Vesting Period	3 years			3 years
Plan 4 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance metrics in restricted shares award type plan	2
Plan 4 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted						166,530
Plan 5 [Member] \| Service-based restriced shares [Member] \| Non-employee independent director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted				20,832	17,240	16,440
Award requisite service period	1 year
Plan 6 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of vesting metrics in restricted shares award type plan	2
Plan 6 [Member] \| Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted							81,680
Plan 6 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted		40,840
Plan 6 [Member] \| Market-based restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted		40,840
Risk-Free Interest Rate		1.00%
Expected Volatility		70.00%
Plan 7 [Member] \| Service-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted	2,200
Award requisite service period	1 year
Plan 1 [Member] \| Service-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted	23,226	29,498	19,532
Award requisite service period	3 years
Minimum [Member] \| Plan 2 [Member] \| Service-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ICP, Threshold target for granting stock awards	20,000
Minimum [Member] \| Plan 4 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of shares earned % of target award	30.00%
Maximum [Member] \| Plan 4 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of shares earned % of target award	250.00%
3 year cash flow metric [Member] \| Plan 3 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award percentage earned based on metric over the performance period	25.00%
3 year cash flow metric [Member] \| Minimum [Member] \| Plan 3 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of shares earned % of target award	30.00%
3 year cash flow metric [Member] \| Maximum [Member] \| Plan 3 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of shares earned % of target award	200.00%
3 year EPS CAGR metric [Member] \| Plan 3 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award percentage earned based on metric over the performance period	75.00%			75.00%
3 year EPS CAGR metric [Member] \| Minimum [Member] \| Plan 3 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of shares earned % of target award	30.00%
3 year EPS CAGR metric [Member] \| Maximum [Member] \| Plan 3 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of shares earned % of target award	250.00%			250.00%
3 year ROIC metric [Member] [Member] \| Plan 3 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award percentage earned based on metric over the performance period				25.00%
3 year ROIC metric [Member] [Member] \| Minimum [Member] \| Plan 3 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of shares earned % of target award				30.00%
3 year ROIC metric [Member] [Member] \| Maximum [Member] \| Plan 3 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of shares earned % of target award				200.00%
2012 EPS growth metric [Member] \| Plan 4 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted					72,576
Award percentage earned based on metric over the performance period	60.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained	175.00%
2012 & 2013 EPS CAGR metric [Member] \| Plan 4 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted				16,054
Award percentage earned based on metric over the performance period	40.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained	125.00%
4 consecutive quarters cumulative EPS 1 [Member] \| Plan 6 [Member] \| Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award percentage earned based on metric over the performance period	50.00%
Cumulative Earnings Per Share		2.00
30 consecutive trading days stock price 1 [Member] \| Plan 6 [Member] \| Market-based restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted		20,420
Award percentage earned based on metric over the performance period	50.00%
Closing Stock Price		30
30 consecutive trading days stock price 2 [Member] \| Plan 6 [Member] \| Market-based restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Shares Granted		20,420
Award percentage earned based on metric over the performance period	50.00%
Closing Stock Price		$ 35