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Commitments and Contingencies Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2013
$
6.2

New claims
7.4

Prior year claims adjustments
(0.8
)
Claims paid
(3.6
)
December 31, 2014
9.2

New claims
2.9

Prior year claims adjustments
7.8

Claims paid
(0.7
)
December 31, 2015
19.2

New claims
8.0

Prior year claims adjustments
—

Claims paid
(19.9
)
December 31, 2016
$
7.3