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Stockholders' Equity - Reconciliation of accumulated other comprehensive loss (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 590.5				$ 590.5
Net current period other comprehensive income	$ 19.9			$ 7.0			54.8	$ 42.7
Ending balance	627.9						627.9
Gains and Losses on Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0.3	$ 0.2	(0.3)	(0.2)	$ (0.1)	$ (3.8)	(0.3)	(3.8)
Other comprehensive income (loss) before reclassifications			0.3			(2.7)
Amounts reclassified from accumulated other comprehensive loss		0.1	0.2		(0.1)	4.3		0.2
Net current period other comprehensive income		0.1	0.5		(0.1)	1.6		0.2
Distribution of MFS						2.1
Ending balance	0.3	0.3	0.2		(0.2)	(0.1)	0.3
Pension & Postretirement
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(50.7)	(51.2)	(51.8)	(35.7)	(36.9)	(82.6)	(51.8)	(82.6)
Other comprehensive income (loss) before reclassifications							8.0
Amounts reclassified from accumulated other comprehensive loss		0.5	0.6		1.2	1.2	(2.3)	1.1
Net current period other comprehensive income		0.5	0.6		1.2	1.2	5.7	1.1
Distribution of MFS						44.5
Ending balance	(45.0)	(50.7)	(51.2)	(34.6)	(35.7)	(36.9)	(45.0)	(34.6)
Foreign Currency Translation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(77.6)	(100.7)	(110.8)	(87.5)	(70.1)	(121.4)	(110.8)	(121.4)
Other comprehensive income (loss) before reclassifications		23.1	10.1		(17.4)	20.3	14.2	5.7
Net current period other comprehensive income		23.1	10.1		(17.4)	20.3	14.2	5.7
Distribution of MFS						31.0
Ending balance	(63.4)	(77.6)	(100.7)	(81.8)	(87.5)	(70.1)	(63.4)	(81.8)
AOCI Attributable to Parent
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(128.0)	(151.7)	(162.9)	(123.4)	(107.1)	(207.8)	(162.9)	(207.8)
Other comprehensive income (loss) before reclassifications		23.1	10.4		(17.4)	17.6	22.2	5.7
Amounts reclassified from accumulated other comprehensive loss		0.6	0.8		1.1	5.5	(2.3)	1.3
Net current period other comprehensive income		23.7	11.2		(16.3)	23.1	19.9	7.0
Distribution of MFS						77.6
Ending balance	$ (108.1)	$ (128.0)	$ (151.7)	$ (116.4)	$ (123.4)	$ (107.1)	$ (108.1)	$ (116.4)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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