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Revenue Recognition Disaggregation of Revenue (Tables)
6 Months Ended
Jun. 30, 2021
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue [Table Text Block] Such revenue was included entirely within Americas Capital Markets and is presented below.
Three Months Ended June 30,Six Months Ended June 30,
(in millions)2021202020212020
Revenue excluded from scope of ASC Topic 606$63.4 53.4 $133.6 102.7 
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Such contract assets and liabilities are presented below.
(in millions)June 30, 2021December 31, 2020
Contract assets, gross$366.1 347.8 
Contract asset allowance(2.4)(2.1)
Contract assets, net$363.7 345.7 
Contract liabilities$95.7 111.0