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Accumulated Other Comprehensive Loss | 6 Months Ended
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Jun. 30, 2019
Accumulated Other Comprehensive Loss |
Accumulated Other Comprehensive Loss | 11. Accumulated Other Comprehensive Loss ​ Accumulated other comprehensive loss consists of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | 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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- References No definition available. + Details
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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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