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Operations and Significant Accounting Policies - Lease Maturities (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Operating Lease Liabilities, Payments Due [Abstract] |  |
2019 | $ 9.9 |
2020 | 7.9 |
2021 | 6.1 |
2022 | 4.9 |
2023 | 3.1 |
Thereafter | 9.4 |
Total Lease Payments Due | 41.3 |
Less: Imputed Interest | 7.3 |
Total Lease Obligations | 34.0 |
Operating Lease Liabilities | $ 8.4 | $ 0.0
Other Current Liabilities | us-gaap:OperatingLeaseLiabilityCurrent |
Operating Lease Liabilities | $ 25.6 | 0.0
Other Non-Current Liabilities | us-gaap:OperatingLeaseLiabilityNoncurrent |
Less: Current Lease Obligations | $ 8.4 | 0.0
Long-term Lease Obligations | $ 25.6 | $ 0.0

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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due in next fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after 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 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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