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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 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
0.7

Prior year claims adjustments
1.5

Claims paid
(3.0
)
September 30, 2017
$
6.5

 
 
December 31, 2015
$
19.2

New claims
7.5

Prior year claims adjustments
(1.6
)
Claims paid
(15.2
)
September 30, 2016
$
9.9