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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2016	Jan. 26, 2016	Dec. 31, 2015
Conversion of Stock [Line Items]
Federal net operating loss			$ 169.3
State net operating loss			102.2
Foreign net operating loss			$ 98.5
Ownership change, percent of equity ownership	50.00%
Ownership change, duration	3 years
Preferred stock, par value (usd per share)	$ 0.01		$ 0.01
Preferred Stock [Member]
Conversion of Stock [Line Items]
Number of securities called by each share		0.0001
Series A Junior Participating Preferred Stock [Member]
Conversion of Stock [Line Items]
Preferred stock, par value (usd per share)		$ 0.01
Ownership percentage to become an acquiring person		4.99%
Exercise price (usd per share)		$ 68.64
Common Stock [Member]
Conversion of Stock [Line Items]
Number of securities called by each share		1