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Summary of Significant Accounting Policies and Recently Issued Accounting Standards - Recently Adopted Accounting Standards (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2019 | Oct. 01, 2018 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cost of sales | [1],[2] | $ (3,230.6) | $ (3,049.5) | $ (2,810.3) |  |  |
Other income (expense), net |  | (0.9) | 1.2 | 0.8 |  |  |
(Decrease) Increase in financing activities |  | (478.3) | (1,889.7) | (544.5) |  |  |
Decrease in investing activities |  | 266.7 | (1,786.1) | 314.8 |  |  |
Deferred tax assets |  | 150.0 | 147.7 |  |  |  |
Decrease in other noncurrent liabilities |  | (653.3) | (490.8) |  |  |  |
Retained earnings |  | (1,835.5) | (1,735.2) |  |  |  |
ASU 2018-02 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Tax Cuts And Jobs Act Of 2017 reclassification from accumulated other comprehensive income to retained earnings Tax Effect |  | $ 13.4 |  |  |  | $ 13.4 |
ASU 2017-07 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cost of sales |  |  | 16.7 | (3.8) |  |  |
Other income (expense), net |  |  | 16.7 | 3.8 |  |  |
ASU 2016-18 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
(Decrease) Increase in financing activities |  |  | (25.4) | $ 3.6 |  |  |
Decrease in investing activities |  |  | $ 27.5 |  |  |  |
ASU 2016-16 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  | $ 7.5
Deferred tax assets |  |  |  |  |  |  | 4.8
Decrease in other noncurrent liabilities |  |  |  |  |  |  | 1.7
Retained earnings |  |  |  |  |  |  | $ 1.0
Scenario, Forecast | ASU 2016-02 | Minimum |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Lease liability |  |  |  |  | $ 75.0 |  |
ROU asset |  |  |  |  | 75.0 |  |
Scenario, Forecast | ASU 2016-02 | Maximum |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Lease liability |  |  |  |  | 95.0 |  |
ROU asset |  |  |  |  | $ 95.0 |  |
[1] | As part of our review of costs included in the corporate segment, amounts related to division operations were identified and reclassified out of other expense, net to cost of sales. The impact for the years ended December 31, 2017 and 2016 was $8.1 million and $6.4 million, respectively.
[2] | Due to the adoption of ASU 2017-07, certain amounts related to defined benefit and other post-employment benefit plans were reclassified from cost of sales to other expense, net. Refer to Note 2, "Recently Adopted and Issued Accounting Standards," in the Notes to Consolidated Financial Statements for more information.

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