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Basis of Presentation Basis of Presentation - Revision of Previously Issued Financial Statements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Change in fair value	$ (18.2)	$ (10.7)	$ (118.9)	$ (77.0)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,671.3	1,543.6	1,671.3	1,543.6	$ 1,583.8	$ 1,557.0	$ 1,464.0	$ 1,395.4
Capital in Excess of Par Value
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Change in fair value	(18.2)	(10.7)	(118.9)	(77.0)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,417.8	2,618.3	2,417.8	2,618.3	2,455.6	2,588.7	2,645.9	2,747.4
Accumulated Deficit
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (594.1)	(913.3)	$ (594.1)	(913.3)	$ (691.7)	$ (885.2)	$ (1,001.9)	$ (1,176.2)
As Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Change in fair value				(66.1)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		1,583.7		1,583.7
As Reported [Member] | Capital in Excess of Par Value
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		2,673.2		2,673.2
As Reported [Member] | Accumulated Deficit
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		(928.1)		(928.1)
Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Change in fair value				(10.9)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		(40.1)		(40.1)
Adjustment [Member] | Capital in Excess of Par Value
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		(54.9)		(54.9)
Adjustment [Member] | Accumulated Deficit
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ 14.8		$ 14.8

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