Share-Based Compensation Plans - Deferred Stock (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 27.1	$ 31.1	$ 40.6
Deferred stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	1.1	0.8	0.7
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 13.8	$ 9.9	$ 12.9
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)	39,805	36,091	33,985
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)	8,388	7,920	5,199
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)	9,966	13,860	10,248
Stock units canceled		1,752

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).

No definition available.

+ Details

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Canceled

+ References

No definition available.

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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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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