Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at January 1	$ 0.0	$ 0.0	$ 0.0
Gross increases - tax positions in prior period	5.1	0.0	0.0
Gross decreases - tax positions in prior period	0.0	0.0	0.0
Settlements	0.0	0.0	0.0
Lapse of statute of limitations	(0.4)	0.0	0.0
Unrecognized tax benefits at December 31	$ 4.7	$ 0.0	$ 0.0

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Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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