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Leases Leases (Tables) | 6 Months Ended
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Jun. 30, 2019
Leases [Abstract] |
Lease, Cost [Table Text Block] | The components of lease expense were as follows:
($ in millions) | Three Months Ended June 30, 2019 |  | Six Months Ended June 30, 2019
Operating lease cost | $ | 3.1 |  |  | $ | 6.3 |
Short-term lease cost | 0.2 |  |  | 0.4 |
Variable lease cost | 0.9 |  |  | 1.5 |
Total lease cost | $ | 4.2 |  |  | $ | 8.2 |
Lessee, Lease Cash Flow and Supplemental Information [Table Text Block] | Supplemental information related to leases was as follows:
($ in millions) | Three Months Ended June 30, 2019 |  | Six Months Ended June 30, 2019
Cash paid for amounts included in the measurement of lease liabilities: |  |  |
Operating cash flows from operating leases | $ | 3.1 |  |  | $ | 6.2 |
Right-of-use assets obtained in exchange for new operating lease liabilities | $ | 1.3 |  |  | $ | 8.1 |
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | Maturities of lease liabilities as of June 30, 2019 were as follows:
($ in millions) | Operating
Year | Leases
2019 (remaining six months) | $ | 6.6 |
2020 | 12.0 |
2021 | 10.2 |
2022 | 8.4 |
2023 | 7.8 |
Thereafter | 48.9 |
| 93.9 |
Less: imputed lease interest | (17.3 | )
Total lease liabilities | $ | 76.6 |
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] | of December 31, 2018 were as follows:
($ in millions) | Operating
Year | Leases
2019 | $ | 13.0 |
2020 | 10.5 |
2021 | 7.8 |
2022 | 6.9 |
2023 | 5.5 |
Thereafter | 37.8 |
Total | $ | 81.5 |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Lessee, Lease Cash Flow and Supplemental Information [Table Text Block] + References No definition available. + Details
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