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Other Comprehensive Income - Components of Accumulated Comprehensive Income (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Equity [Abstract]
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $12.9 million and $13.8 million at September 30, 2018 and December 31, 2017, respectively	$ (22.6)	$ (24.9)
Accumulated unrealized (loss) gain on derivative instruments, net of income tax benefit of $1.5 million and $0.2 million at September 30, 2018 and December 31, 2017, respectively	(1.3)	0.4
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $2.7 million and $4.5 million at September 30, 2018 and December 31, 2017, respectively	(90.3)	(64.9)
Accumulated other comprehensive loss	(114.2)	(89.4)
Accumulated pension and OPEB tax	12.9	13.8
Accumulated tax on gain (loss) on financial instruments	1.5	0.2
Accumulated tax on gain (loss) on unrealized translation adjustments	$ 2.7	$ 4.5

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- Definition

Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax

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Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans, Tax

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Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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