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Financial Instruments - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the period		$ (85.7)	$ (122.2)
Adoption of accounting standard	[1]				$ 6.5
Other comprehensive income (loss) before reclassifications		(35.0)	31.0
Amounts reclassified from accumulated other comprehensive income (loss)		5.0	2.0
Income tax benefit		0.1	3.5
Other comprehensive income (loss)		(29.9)	36.5	$ (35.1)
Balance at the end of the period		(122.1)	(85.7)	(122.2)
Accrued post-retirement benefit liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the period		(31.6)	(26.4)
Adoption of accounting standard					(6.5)
Other comprehensive income (loss) before reclassifications		(5.1)	(11.2)
Amounts reclassified from accumulated other comprehensive income (loss)		4.6	2.5
Income tax benefit		0.1	3.5
Other comprehensive income (loss)		(0.4)	(5.2)
Balance at the end of the period		(38.5)	(31.6)	(26.4)
Foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the period		(50.1)	(96.7)
Other comprehensive income (loss) before reclassifications		(30.3)	46.6
Other comprehensive income (loss)		(30.3)	46.6
Balance at the end of the period		(80.4)	(50.1)	(96.7)
Foreign currency forward contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the period		(4.0)	0.9
Other comprehensive income (loss) before reclassifications		0.4	(4.4)
Amounts reclassified from accumulated other comprehensive income (loss)		0.4	(0.5)
Income tax benefit		0.0	0.0
Other comprehensive income (loss)		0.8	(4.9)
Balance at the end of the period		(3.2)	(4.0)	0.9
Accumulated Other Comprehensive Income (loss).
Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of accounting standard	[1]				$ (6.5)
Other comprehensive income (loss)		$ (29.9)	$ 36.5	$ (35.1)
[1] Refer to Note 1 for further information regarding new accounting standards adopted.

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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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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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