Segment Information (Revenues And Long-Lived Assets By Geographic Area) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 3,085.1	$ 2,517.1	$ 5,996.5	$ 4,939.4
Long-lived Assets	1,277.3		1,277.3		$ 1,247.2
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,423.9	1,928.6	4,715.9	3,764.8
Long-lived Assets	225.2		225.2		188.3
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	502.3	466.3	978.2	936.4
Long-lived Assets	31.6		31.6		29.8
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	297.6	266.0	582.7	543.5
Rest of World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	158.9	$ 122.2	302.4	$ 238.2
Long-lived Assets	$ 1,020.5		$ 1,020.5		$ 1,029.1