A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

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

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- Definition

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

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

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- Definition

Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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- Definition

Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act.

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Accumulated Other Comprehensive Loss - Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		9 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity		$ 1,798.9		$ 1,798.9		$ 1,798.9
Other comprehensive income (loss) before reclassifications						(8.7)
Amounts reclassified from accumulated other comprehensive loss						(1.3)
Current period other comprehensive income (loss)						(10.0)
Reclassification of stranded tax effects		(30.0)				(30.0)
Ending equity	$ 1,915.6					1,915.6
Cash flow hedge (loss) gain
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity		0.8		0.8		0.8
Other comprehensive income (loss) before reclassifications						(0.5)
Amounts reclassified from accumulated other comprehensive loss						(0.7)
Current period other comprehensive income (loss)						(1.2)
Reclassification of stranded tax effects						0.0
Ending equity	(0.4)					(0.4)
Unrealized gain (loss) on available-for- sale securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity		(2.0)		(2.0)		(2.0)
Other comprehensive income (loss) before reclassifications						0.7
Amounts reclassified from accumulated other comprehensive loss						1.8
Current period other comprehensive income (loss)						2.5
Reclassification of stranded tax effects						0.0
Ending equity	0.5					0.5
Pension and post retirement benefit plan adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity		(158.7)		(158.7)		(158.7)
Other comprehensive income (loss) before reclassifications						0.0
Amounts reclassified from accumulated other comprehensive loss	1.9		$ 1.9			5.3	$ 5.8
Current period other comprehensive income (loss)						5.3
Reclassification of stranded tax effects						(30.0)
Ending equity	(183.4)					(183.4)
Cumulative translation adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity		(125.8)		(125.8)		(125.8)
Other comprehensive income (loss) before reclassifications						(8.9)
Amounts reclassified from accumulated other comprehensive loss						(7.7)
Current period other comprehensive income (loss)						(16.6)
Reclassification of stranded tax effects						0.0
Ending equity	(142.4)					(142.4)
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity	(309.7)	$ (285.7)	(285.5)	(285.7)	$ (269.8)	(285.7)	(269.8)
Current period other comprehensive income (loss)	(16.0)		5.4	6.0	(15.7)
Reclassification of stranded tax effects				30.0
Ending equity	$ (325.7)		$ (280.1)	$ (309.7)	$ (285.5)	$ (325.7)	$ (280.1)