Stock Compensation Plans - Narrative (Details) - USD ($) $ / shares in Units, $ 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]
Current Fiscal Year End Date		--12-31
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2016
Share Based Compensation Plans (Additional Textual) [Abstract]
Expected life - years	5 years	5 years	5 years
Total intrinsic value of options exercised	$ 1.7	$ 5.6	$ 21.5
Recognized Stock-based compensation expense before tax	5.9	6.6	13.7
Amount accrued for shares settling in cash	$ 1.2	6.1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Share Based Compensation Plans (Textual) [Abstract]
Recognized Stock-based compensation expense after tax	$ 3.7	$ 4.1	$ 8.5
Recognized Stock-based compensation expense diluted share	$ 0.05	$ 0.05	$ 0.09
Estimated forfeitures	2.30%
Net cash proceeds from the exercise of stock options	$ 4.3	$ 4.1	$ 16.8
Income tax benefits		$ 1.3	$ 5.9
Restricted deferred shares and deferred dividend credits	1,349,175
Shares distributed	188,383	103,953	171,135
Number of shares available for future grants for all plans	6,238,995
Unrecognized compensation expense is expected to be recognized over a total weighted average period	2 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 6.49	$ 11.67	$ 23.09
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.22%	1.58%	1.64%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	3.04%	2.29%	1.75%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	34.12%	36.53%	50.96%
Employee service share based compensation, tax shortfall from compensation expense	$ 0.3
Stock Options [Member]
Share Based Compensation Plans (Additional Textual) [Abstract]
Expected life - years	10 years
Restricted deferred shares and deferred dividend awarded [Member]
Share Based Compensation Plans (Additional Textual) [Abstract]
Shares awarded	613,165	485,975	520,912
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,349,175	1,014,770
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 34.96	$ 40.69
Share Based Compensation Plans (Additional Textual) [Abstract]
Canceled or expired, Number of Shares	(90,377)
Shares awarded	613,165
Unrecognized Compensation expense related to stock option awards, restricted shares and deferred shares	$ 24.1
Recognized Stock-based compensation expense before tax	$ 8.2	$ 11.8	$ 10.1
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Option Forfeited in Period Weighted Average Grant Date Fair Value	$ 39.92
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 28.21
Share Based Compensation Plans (Textual) [Abstract]
Vested, Number of shares	(188,383)
Vested, Weighted-average Grant Date Fair Value	$ 41.48
Strategic Performance Shares [Member]
Share Based Compensation Plans (Additional Textual) [Abstract]
Shares awarded	368,815
Vesting period	3 years
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Plans (Additional Textual) [Abstract]
Shares awarded	265,930
Shares expected to settle in cash	10,700
Shares expected to settle in shares	255,230
Share Based Compensation Plans (Textual) [Abstract]
Vest in percentage increments of restricted shares	25.00%
Performance Shares [Member]
Share Based Compensation Plans (Additional Textual) [Abstract]
Shares expected to settle in cash	10,880
Shares expected to settle in shares	357,935
Maximum [Member] \| Restricted Stock Units (RSUs) [Member]
Share Based Compensation Plans (Additional Textual) [Abstract]
Vesting period	5 years

End date of current fiscal year in the format --MM-DD.

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This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.

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Estimated Forfeitures of Stock Options for the period.

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Share based compensation plans.

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Share based compensation plans.

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Shares distributed due to vesting of restricted, deferred shares and deferred dividend credits.

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Stock-based compensation expense diluted share.

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Vest in percentage increments of restricted shares.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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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.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Percentage of vesting of share-based compensation awards.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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