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Present and Prospective Accounting Pronouncements Cumulative Effect of changes due to adoption of ASU 2014-09 and 2018-02 (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Receivables, net of allowance of doubtful accounts | $ 143.5 |  |  | $ 142.5 |  |  |
Inventories | 284.4 |  |  | 259.1 |  |  |
Deferred tax asset | 2.9 |  |  | 2.5 |  |  |
Retained earnings | 1,613.9 |  |  | 1,280.1 |  |  |
Accumulated comprehensive loss | $ (148.0) | $ (147.3) |  | $ (122.1) | $ (129.4) | $ (140.8) | $ (137.2)
Balance upon adoption [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Receivables, net of allowance of doubtful accounts |  |  | $ 120.8 |  |  |  |
Inventories |  |  | 274.9 |  |  |  |
Deferred tax asset |  |  | 4.0 |  |  |  |
Retained earnings |  |  | 1,292.4 |  |  |  |
Accumulated comprehensive loss |  |  | (138.8) |  |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Receivables, net of allowance of doubtful accounts |  |  | (21.7) |  |  |  |
Inventories |  |  | 15.8 |  |  |  |
Deferred tax asset |  |  | 1.5 |  |  |  |
Retained earnings |  |  | (4.4) |  |  |  |
Accumulated comprehensive loss |  |  | 0.0 |  |  |  |
Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Receivables, net of allowance of doubtful accounts |  |  | 0.0 |  |  |  |
Inventories |  |  | 0.0 |  |  |  |
Deferred tax asset |  |  | 0.0 |  |  |  |
Retained earnings |  |  | 16.7 |  |  |  |
Accumulated comprehensive loss |  |  | $ (16.7) |  |  |  |

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