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Leases (Tables) | 9 Months Ended
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Sep. 30, 2019
Leases |
Schedule of lease cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended | ​ | Nine Months Ended
​ | September 30, | ​ | September 30,
​ | 2019 |  | 2018 |  | 2019 |  | 2018
​ | (in millions)
Operating lease cost | $ | 20.9 | ​ | $ | 21.2 | ​ | $ | 62.8 | ​ | $ | 61.6
Schedule of supplemental cash flow and other lease information | ​
​ | ​ | ​
​ | September 30,
​ | 2019
​ | (in millions)
Supplemental cash flow information: | ​ | ​
Cash payments for operating leases (nine months ended) | $ | 62.6
Right-of-use assets obtained in exchange for lease obligations (nine months ended) | $ | 53.2
​ | ​ | ​
Other lease information: | ​ | ​
Weighted average remaining lease term—operating leases | ​ | 5.8 years
Weighted average discount rate—operating leases | ​ | 4.4%
Schedule of maturities of operating lease liabilities | ​
​ | ​ | ​
​ | (in millions)
2019 (remaining three months) | $ | 15.8
2020 | ​ | 56.0
2021 | ​ | 44.4
2022 | ​ | 32.5
2023 | ​ | 24.6
Thereafter | ​ | 58.0
Total operating lease payments | ​ | 231.3
Less: imputed interest | ​ | (31.4)
Total operating lease liabilities | $ | 199.9
Schedule of future minimum payments under the non-cancelable leases | ​
​ | ​ | ​
​ | (in millions)
2019 | $ | 59.5
2020 | ​ | 45.5
2021 | ​ | 32.9
2022 | ​ | 22.7
2023 | ​ | 16.2
Thereafter | ​ | 40.7
Total operating lease payments | $ | 217.5

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- Definition Tabular disclosure of future minimum lease payments as of the date of the latest balance sheet presented, in aggregate and for each of the five years succeeding fiscal years under operating and capital leases. + References No definition available. + Details
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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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