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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2016
$
7.3

New claims
0.2

Prior year claims adjustments
1.7

Claims paid
(2.3
)
June 30, 2017
$
6.9

 
 
December 31, 2015
$
19.2

New claims
5.7

Prior year claims adjustments
(1.7
)
Claims paid
(5.4
)
June 30, 2016
$
17.8