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Share-Based Compensation Plans - Deferred Stock (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 28.7	$ 27.1	$ 31.1
Deferred stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	1.4	1.1	0.8
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 12.3	$ 13.8	$ 9.9
In lieu of annual cash retainer | Deferred stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units granted at period end (in shares)	43,442	39,805	36,091
Additional compensation for board service | Deferred stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units granted at period end (in shares)	9,857	8,388	7,920
Additional compensation for board service | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units granted at period end (in shares)	9,792	9,966	13,860
Stock units canceled (in shares)			1,752

X

- Definition

The number of grants made at period end on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

No definition available.

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- Definition

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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