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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 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
2.2

Prior year claims adjustments
13.9

Claims paid
(1.6
)
March 31, 2018
$
41.2

 
 
December 31, 2016
$
7.3

New claims
0.3

Prior year claims adjustments
0.3

Claims paid
(2.3
)
March 31, 2017
$
5.6