Segment Information Major Geographic Area (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues and Long-Lived Assets
Long-Lived Assets	$ 884.3				$ 840.1				$ 884.3	$ 840.1
Revenue	2,122.7	1,700.4	1,756.2	1,543.0	2,063.3	1,670.4	1,715.7	1,506.8	7,122.3	6,956.2	7,014.6
Domestic
Revenues and Long-Lived Assets
Long-Lived Assets	545.7				502.5				545.7	502.5
Revenue									3,972.6	3,803.6	3,887.7
Total international
Revenues and Long-Lived Assets
Long-Lived Assets	338.6				337.6				338.6	337.6
Revenue									3,149.7	3,152.6	3,126.9
United Kingdom
Revenues and Long-Lived Assets
Long-Lived Assets	60.8				64.3				60.8	64.3
Revenue									568.3	572.0	539.4
Continental Europe
Revenues and Long-Lived Assets
Long-Lived Assets	79.6				76.0				79.6	76.0
Revenue									800.6	823.1	908.9
Asia Pacific
Revenues and Long-Lived Assets
Long-Lived Assets	88.8				88.0				88.8	88.0
Revenue									868.9	838.1	741.7
Latin America
Revenues and Long-Lived Assets
Long-Lived Assets	72.3				70.5				72.3	70.5
Revenue									464.5	450.1	444.4
Other
Revenues and Long-Lived Assets
Long-Lived Assets	37.1				38.8				37.1	38.8
Revenue									$ 447.4	$ 469.3	$ 492.5