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Revenue Recognition Disaggregation of Revenue (Tables)
3 Months Ended
Mar. 31, 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 March 31,
(in millions)20212020
Revenue excluded from scope of ASC Topic 606$70.2 49.3 
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Such contract assets and liabilities are presented below.
(in millions)March 31, 2021December 31, 2020
Contract assets, gross$348.3 347.8 
Contract asset allowance(2.4)(2.1)
Contract assets, net$345.9 345.7 
Contract liabilities$105.4 111.0