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Leases (Tables) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Dec. 31, 2018
Leases [Abstract] |  |
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | Minimum future lease payments due in each of the next five years and thereafter, as of June 30, 2019, in accordance with ASC Topic 842, are presented in the table below.
(in millions) |  | ASC 842
2019 (remaining 6 months) |  | $ | 79.5 |
2020 |  | 152.6 |
2021 |  | 132.8 |
2022 |  | 100.9 |
2023 |  | 80.9 |
Thereafter |  | 236.3 |
Total future minimum lease payments |  | $ | 783.0 |
Less imputed interest |  | 97.0 |
Total |  | $ | 686.0 |
Lease, Cost [Table Text Block] | Other information related to operating leases was as follows.
|  | June 30, 2019
Weighted Average Remaining Lease Term |  | 6.8 years |
Weighted Average Discount Rate |  | 3.9 | %
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] |  | Minimum future lease payments due in each of the next five years and thereafter, as of December 31, 2018, in accordance with ASC Topic 840 included in our 2018 Annual Report on Form 10-K, are presented in the table below.
(in millions) |  | ASC 840
2019 |  | $ | 167.8 |
2020 |  | 153.1 |
2021 |  | 132.3 |
2022 |  | 99.4 |
2023 |  | 81.0 |
Thereafter |  | 257.3 |
Total future minimum lease payments |  | $ | 890.9 |

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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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