Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income tax expense	$ 118.6	$ 99.7	$ 380.1	$ 276.6
Effective tax rate	33.60%	32.80%	34.10%	32.80%