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Commitments and Contingent Liabilities - Lease Commitments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract] |  |  |
Rent expense net of sublease rental income | $ 7.3 | $ 6.8 | $ 7.8
Operating Leases, Rent Expense, Sublease Rentals | 2.3 | $ 2.2 | $ 1.3
Capital Leases [Abstract] |  |  |
2018 | 2.3 |  |
2019 | 2.3 |  |
2020 | 2.3 |  |
2021 | 2.3 |  |
2022 | 2.3 |  |
2023 and thereafter | 2.6 |  |
Total minimum lease payments | 14.1 |  |
Capital Leases, Future Minimum Sublease Rentals | 0.0 |  |
Capital Leases, Future Minimum Payments, Net Minimum Payments | 14.1 |  |
Capital Leases, Future Minimum Payments, Interest Included in Payments | (1.6) |  |
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments | 12.5 |  |
Operating Lease Future Minimum Payments [Abstract] |  |  |
2018 | 9.7 |  |
2019 | 9.3 |  |
2020 | 8.8 |  |
2021 | 8.1 |  |
2022 | 6.1 |  |
2023 and thereafter | 3.8 |  |
Total minimum lease payments | 45.8 |  |
Future operating lease payments | 45.8 |  |
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals | (8.8) |  |
Operating Leases, Future Minimum Payments, Net Minimum Payments | $ 37.0 |  |

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- Definition Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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