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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2020
Income Taxes |
Schedule of provision for income taxes and effective tax rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended June 30, |  | Six Months Ended June 30, | ​
​ | ​ | 2020 | ​ | 2019 | ​ | 2020 | ​ | 2019 | ​
Provision for income taxes | ​ | $ | (68.0) | ​ | $ | (78.7) | ​ | $ | (114.0) | ​ | $ | (158.3) | ​
Effective tax rate | ​ |  | 20.7 | % |  | 21.3 | % |  | 18.5 | % |  | 22.0 | %

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