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Commitments and Contingencies Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 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, 2015 | $ | 19.2 |
New claims | 8.0 |
Prior year claims adjustments | — |
Claims paid | (19.9 | )
December 31, 2016 | 7.3 |
New claims | 21.0 |
Prior year claims adjustments | 1.4 |
Claims paid | (3.0 | )
December 31, 2017 | 26.7 |
New claims | 3.5 |
Prior year claims adjustments | 20.5 |
Claims paid | (7.6 | )
December 31, 2018 | $ | 43.1 |

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