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Basis of Presentation Basis of Presentation - Revision of Previously Issued Financial Statements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,616.5	$ 1,409.9	$ 1,557.0	$ 1,395.4
Change in fair value	(20.3)	(42.2)
Capital in Excess of Par Value
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,551.3	2,685.9	2,588.7	2,747.4
Change in fair value	(20.3)	(42.2)
Accumulated Deficit
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (782.9)	(1,093.7)	$ (885.2)	$ (1,176.2)
As Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		1,440.8
Change in fair value		(40.5)
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		2,731.6
As Reported [Member] | Accumulated Deficit
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		(1,108.5)
Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		(30.9)
Change in fair value		(1.7)
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		(45.7)
Adjustment [Member] | Accumulated Deficit
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ 14.8

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