Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Carrying value of indefinite-lived intangible assets other than goodwill	$ 391.0		$ 391.0		$ 360.0
Amortization of expense of intangible assets	$ 66.6	$ 52.4	$ 131.0	$ 92.2