Income Taxes - Narrative (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		45 Months Ended	57 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Effective income tax rate	31.50%	29.60%
Tax benefit recognized from adjustments and other provisions			$ 16.5	$ 13.3