Income Taxes (Valuation Allowance) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2014
Beginning balance	$ 50.5
Valuation allowance change	19.3	$ 35.0	$ 30.0
Valuation Allowance Deferred Tax Assets Written Off	0.0	4.6		$ 0.0
Accumulated other comprehensive income (loss)	(1.0)	(7.6)	2.7
Ending balance	373.7	332.2	344.6
Foreign Tax Credits [Domain]
Valuation allowance change		17.3
Increase to valuation allowance [Member]
Valuation allowance change	46.0	54.9	176.5
Decrease to valuation allowance [Member]
Valuation allowance change	$ (56.8)	$ (55.1)	(19.1)
Tax Cuts and Jobs Act Final [Domain]
Valuation allowance change			$ 100.0

Accumulated Other Comprehensive Income Or LossOn Valuation Allowance Deferred Tax Assets

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- Definition

Valuation Allowance Deferred Tax Assets Written Off

+ References

No definition available.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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- Definition

The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 30
-Paragraph 5
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-Publisher FASB
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- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=116821951&loc=d3e32123-109318

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