Fair Value Measurements (Changes in Level 3 Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value liabilities beginning balance	$ 0.0	$ 0.0	$ 0.0	$ 55.4
Total (Gains) Losses:
Included in Earnings	0.0	0.0	0.0	(0.1)
Included in Other Comprehensive Income	0.0	0.0	0.0	0.0
Purchases, Issues, Sales, and Settlements
Purchases	0.0	0.0	0.0	0.0
Settlements	0.0	0.0	0.0	55.3
Fair value liabilities ending balance	0.0	0.0	0.0	0.0
Swap Related to Sale of Certain Visa Class B Common Shares
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value liabilities beginning balance	11.3	0.0	0.0	0.0
Total (Gains) Losses:
Included in Earnings	0.2	0.0	11.5	0.0
Included in Other Comprehensive Income	0.0	0.0	0.0	0.0
Purchases, Issues, Sales, and Settlements
Purchases	0.0	0.0	0.0	0.0
Settlements	(0.6)	0.0	0.6	0.0
Fair value liabilities ending balance	$ 10.9	$ 0.0	$ 10.9	$ 0.0