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Intangible Assets And Goodwill (Components Of Intangible Assets) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Indefinite-lived Intangible Assets $ 2,513.9 $ 2,537.9
Other Indefinite-lived Intangible Assets [1] 17,175.3 17,175.3
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Indefinite-lived Intangible Assets 450.0 450.0
Clearing Firm, Market Data And Other Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 2,838.8 2,838.8
Accumulated amortization (778.2) (754.5)
Net book value 2,060.6 2,084.3
Technology-Related Intellectual Property [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 29.4 29.4
Accumulated amortization (27.5) (27.2)
Net book value 1.9 2.2
Other Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 2.4 2.4
Accumulated amortization (1.0) (1.0)
Net book value 1.4 1.4
Total Amortizable Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 2,870.6 2,870.6
Accumulated amortization (806.7) (782.7)
Net book value $ 2,063.9 $ 2,087.9
[1] )Trading products represent futures and options products acquired in our business combinations with CBOT Holdings, Inc., NYMEX Holdings, Inc. and The Board of Trade of Kansas City, Missouri, Inc. Clearing and transaction fees are generated through the trading of these products. These trading products, most of which have traded for decades, require authorization from the Commodity Futures Trading Commission (CFTC). Product authorizations from the CFTC have no term limits