Income Taxes (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Net unrecognized tax benefit	$ 61,300,000			$ 61,300,000		$ 63,800,000
Income tax interest and penalties accrued	600,000.0			600,000.0
Decrease in unrecognized tax benefits during the period		9,300,000
Deferred tax assets	140,400,000			140,400,000
Effective tax rate	1.40%		15.50%	6.90%	11.10%
Unrecognized tax benefits offsetting against short-term tax assets	1,700,000			1,700,000
Unrecognized tax benefits offsetting against long-term deferred tax assets	$ 28,700,000			$ 28,700,000
U.S. federal statutory rate				35.00%