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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2019
Accumulated Other Comprehensive Loss |
Schedule of amounts recognized in accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | Accumulated
​ | ​ | Foreign | ​ | ​ | ​ | ​ | Other
​ | ​ | Currency | ​ | ​ | Cash Flow | ​ | Comprehensive
​ |  | Translation |  | ​ | Hedges (1) |  | Loss
​ | ​ | (in millions)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance December 31, 2018 | ​ | $ | (126.3) | ​ | $ | 5.2 | ​ | $ | (121.1)
Change in period | ​ |  | (4.6) | ​ |  | (1.3) | ​ |  | (5.9)
Balance March 31, 2019 | ​ | $ | (130.9) | ​ | $ | 3.9 | ​ | $ | (127.0)
Change in period | ​ |  | 3.5 | ​ |  | (2.4) | ​ |  | 1.1
Balance June 30, 2019 | ​ | $ | (127.4) | ​ | $ | 1.5 | ​ | $ | (125.9)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance December 31, 2017 | ​ | $ | (102.6) | ​ | $ | 3.5 | ​ | $ | (99.1)
Change in period | ​ |  | 9.7 | ​ |  | 2.8 | ​ |  | 12.5
Balance April 01, 2018 | ​ | $ | (92.9) | ​ | $ | 6.3 | ​ | $ | (86.6)
Change in period | ​ |  | (26.6) | ​ |  | 1.0 | ​ |  | (25.6)
Balance July 01, 2018 | ​ | $ | (119.5) | ​ | $ | 7.3 | ​ | $ | (112.2)
(1) | Cash flow hedges include interest rate swaps and designated foreign currency hedges. See Note 7 for further details.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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