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Commitments and Contingencies Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Loss Contingencies by Contingency [Table Text Block]
The following table shows the professional indemnity accrual activity and related payments.
(in millions)
December 31, 2020$48.2 
New claims1.6 
Prior year claims adjustments (including foreign currency changes)(10.5)
Claims paid(38.1)
December 31, 20211.2 
New claims1.3 
Prior year claims adjustments (including foreign currency changes)(0.1)
Claims paid(0.2)
December 31, 20222.2 
New claims7.0 
Prior year claims adjustments (including foreign currency changes)5.2 
Claims paid(5.0)
December 31, 2023$9.4