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Stock Options, Restricted Stock and Restricted Stock Units - Tax shortfall (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of information regarding share-based payment arrangements
Tax shortfall associated with stock-based compensation arrangements		$ (0.4)
Tax (shortfall) windfall related to share-based payment arrangements	$ 1.2

X

- Definition

Amount of decrease in additional paid in capital (APIC) resulting from a tax deficiency associated with a share-based compensation plan other than an employee stock ownership plan (ESOP).

+ References

No definition available.

+ Details

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X

- Definition

Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901

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X

- References

No definition available.

+ Details

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