Acquisitions and Dispositions - 2012 Acquisitions (Details) In Millions, unless otherwise specified				1 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Jul. 31, 2012 Parspro USD ($)	Jun. 30, 2012 Provoloto USD ($)	Jun. 30, 2012 ADS GBP (£)
Business Acquisition [Line Items]
Consideration transferred				$ 11.8	$ 9.7	£ 3.5
Consideration transferred, liabilities incurred					2.0
Percentage of voting interests acquired					100.00%
Goodwill	$ 1,186.9	$ 801.4	$ 768.4	$ 9.9	$ 5.1	£ 2.2