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Income Taxes, Tax Cuts and Jobs Act (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2019	Mar. 31, 2018
Income Taxes [Abstract]
Provisional income tax expense (benefit) related to US Tax Reform				$ 38.0
Deferred tax assets - change in amount				(19.0)
Transition tax charge				$ 19.0
Income tax expense (benefit) related to US Tax Reform	$ 2.2	$ (24.4)	$ (7.7)
Reduction in provisional charge related to US Tax Reform			(9.3)
Transition tax liability			18.9
Reduction in transition tax liability			(0.1)
Charge for reduction in state deferred tax assets			$ 1.7

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Increase (decrease) in stated deferred tax assets.

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- Definition

Amount of measurement period adjustment increase (decrease) to the transition tax liability from accounting for tax effect pursuant to Tax Cuts and Jobs Act.

+ References

No definition available.

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- Definition

Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

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Amount of reasonable estimate for income tax expense for which accounting for tax effect for remeasurement of deferred tax asset from change in tax rate is incomplete pursuant to Tax Cuts and Jobs Act.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2A
-Subparagraph (SAB Topic 5.EE.Q2(b))
-URI http://asc.fasb.org/extlink&oid=116825942&loc=SL116722634-122817

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Amount of reasonable estimate for income tax expense (benefit) for which accounting for tax effect is incomplete pursuant to Tax Cuts and Jobs Act.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of reasonable estimate for income tax expense for which accounting for tax effect from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated is incomplete pursuant to Tax Cuts and Jobs Act.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount of income tax expense (benefit) for measurement period adjustment from accounting for tax effect pursuant to Tax Cuts and Jobs Act.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount of tax liability from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act.

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-Name Accounting Standards Codification
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