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Stock-Based Compensation Plans - Summary of Unrecognized Stock-based Compensation Expense (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense	$ 29.2
Weighted Average Remaining Vesting Period (Years)	3 years 11 months 27 days
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense	$ 2.9
Weighted Average Remaining Vesting Period (Years)	1 year 4 months 28 days
Restricted Stock Units (RSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense	$ 8.5
Weighted Average Remaining Vesting Period (Years)	4 years 3 months 4 days
Performance Share Units (PSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense	$ 17.8
Weighted Average Remaining Vesting Period (Years)	4 years 3 months 8 days

X

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

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+ References

No definition available.

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