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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2013	Mar. 31, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate		35.00%	35.00%
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost					$ 16.5
Provision (benefit) for income taxes	$ 1.6
Payment of long-term deposit				$ (17.1)
Income Taxes Receivable, Current	1.4	$ 1.4
Unrecognized Tax Benefits	$ 34.4	$ 34.4

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

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The net cash inflow or outflow for the increase (decrease) in the beginning and end of period deposits balances.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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