Accounting for Uncertainty in Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Sep. 30, 2015
Deferred Taxes Classification [Line Items]
Liability for unrecognized tax benefits that would affect effective tax rate, if recognized	$ 73.2	$ 80.0
Number of tax years the company is currently open to audit by tax authorities	8 years
Maximum
Deferred Taxes Classification [Line Items]
Liability for unrecognized tax benefits for interest and penalties	$ 2.0	$ 2.0