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NEW ACCOUNTING PRONOUNCEMENTS - Cumulative Effect on Balance Sheet (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 01, 2017 | Jul. 01, 2017 | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Assets |  |  |  |  |
Accounts receivable, net |  |  | $ 247.1 | $ 231.5 | $ 267.5
Inventories, net |  |  | 141.9 | 102.8 | 143.0
Contract assets |  |  | 92.4 | 70.7 | 0.0
Other current assets |  |  | 74.3 | 94.1 | 97.7
Deferred income taxes |  |  | 29.5 | 50.0 | 50.9
Liabilities [Abstract] |  |  |  |  |
Contract liabilities |  |  |  | 86.9 |
Accrued expenses |  |  | 179.8 | 193.6 | 292.6
Other long-term liabilities |  |  | 849.1 | 884.2 | 885.8
Equity [Abstract] |  |  |  |  |
Accumulated other comprehensive income |  |  | 251.5 | 249.8 | 250.1
Retained deficit |  |  | 707.9 | 738.3 | 742.3
Accounting Standards Update 2016-16 |  |  |  |  |
Equity [Abstract] |  |  |  |  |
Retained deficit |  |  |  | 0.2 |
Accounting Standards Update 2017-07 |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Net periodic defined benefits expense (reversal of expense), excluding service cost component | $ 1.1 | $ 2.4 |  |  |
Accounting Standards Update 2018-02 |  |  |  |  |
Equity [Abstract] |  |  |  |  |
Retained deficit |  |  |  | 4.8 |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |
Assets |  |  |  |  |
Accounts receivable, net |  |  | 287.3 |  |
Inventories, net |  |  | 198.4 |  |
Contract assets |  |  | 0.0 |  |
Other current assets |  |  | 78.4 |  |
Deferred income taxes |  |  | 31.0 |  |
Liabilities [Abstract] |  |  |  |  |
Contract liabilities |  |  | 0.0 |  |
Accrued expenses |  |  | 271.7 |  |
Other long-term liabilities |  |  | 850.6 |  |
Equity [Abstract] |  |  |  |  |
Accumulated other comprehensive income |  |  | 252.2 |  |
Retained deficit |  |  | 713.8 |  |
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |
Assets |  |  |  |  |
Accounts receivable, net |  |  |  |  | 267.5
Inventories, net |  |  |  |  | 143.0
Contract assets |  |  |  |  | 0.0
Other current assets |  |  |  |  | 97.7
Deferred income taxes |  |  |  |  | 50.9
Liabilities [Abstract] |  |  |  |  |
Contract liabilities |  |  |  |  | 0.0
Accrued expenses |  |  |  |  | 292.6
Other long-term liabilities |  |  |  |  | 885.8
Equity [Abstract] |  |  |  |  |
Accumulated other comprehensive income |  |  |  |  | 250.1
Retained deficit |  |  |  |  | 742.3
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |
Assets |  |  |  |  |
Accounts receivable, net |  |  | 40.2 |  | (36.0)
Inventories, net |  |  | 56.5 | $ 40.2 | (40.2)
Contract assets |  |  | (92.4) |  | 70.7
Other current assets |  |  | 4.1 |  | (3.6)
Deferred income taxes |  |  | 1.5 |  | (0.9)
Liabilities [Abstract] |  |  |  |  |
Contract liabilities |  |  | (78.3) |  | 86.9
Accrued expenses |  |  | 91.9 |  | (99.0)
Other long-term liabilities |  |  | 1.5 |  | (1.6)
Equity [Abstract] |  |  |  |  |
Accumulated other comprehensive income |  |  | 0.7 |  | (0.3)
Retained deficit |  |  | $ 5.9 |  | $ (4.0)

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