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Share-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified			3 Months Ended			3 Months Ended			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Restricted stock units	Mar. 31, 2014 Long-Term Incentive Plan	Mar. 31, 2014 Long-Term Incentive Plan Stock Options	Mar. 31, 2014 Long-Term Incentive Plan Restricted stock units	Mar. 31, 2013 Long-Term Incentive Plan Restricted stock units	May 31, 2012 Long-Term Incentive Plan Restricted stock units	Mar. 31, 2014 Long-Term Incentive Plan Performance Unit Awards	Mar. 31, 2014 Certain executive officers Long-Term Incentive Plan Restricted stock units	Mar. 31, 2014 Personnel Accruals Long-Term Incentive Plan Restricted stock units	Dec. 31, 2013 Personnel Accruals Long-Term Incentive Plan Restricted stock units	Mar. 31, 2014 Personnel Accruals Long-Term Incentive Plan Performance Unit Awards
Share-Based Compensation
Common stock authorized for issuance (in shares)				7,500,000	1,000,000
Offer price per share received as cash settlement on restricted stock awards vested in 2012								$ 30.00
Vesting period						3 years				1 year
Vesting rights percentage			33.33%
Number of shares, right to receive cash payment equal to fair value of which is received per unit on vesting of award						1
Unrecognized compensation cost						$ 3.7
Weighted-average period for amortization of unrecognized compensation cost						1 year
Compensation expense						0.5	5.4		1.8
Liability for unvested restricted share awards	$ 35.0	$ 45.8									$ 9.4	$ 8.9	$ 5.7

X

- Definition

Represents the offer price per share on restricted stock awards vested as a result of the Transaction Agreement and change in control at the parent company.

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Represents the number of shares, right to receive cash payment equal to fair value of which is received per unit on vesting of award.

+ References

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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.

+ References

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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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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Percentage of vesting of share-based compensation awards.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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