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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2018
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, 2017
$
26.7

New claims
2.3

Prior year claims adjustments
12.3

Claims paid
(7.3
)
September 30, 2018
$
34.0

 
 
December 31, 2016
$
7.3

New claims
0.7

Prior year claims adjustments
1.5

Claims paid
(3.0
)
September 30, 2017
$
6.5