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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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Stock Compensation Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Current Fiscal Year End Date									--12-31
Document Period End Date									Dec. 31, 2017
Document Fiscal Year Focus									2017
Share Based Compensation Plans (Additional Textual) [Abstract]
Expected life - years									5 years	5 years	5 years
Total intrinsic value of options exercised									$ 14.7	$ 1.7	$ 5.6
Unrecognized Compensation expense related to stock option awards, restricted shares and deferred shares	$ 29.4								29.4
Recognized Stock-based compensation expense before tax									5.2	5.9	6.6
Amount accrued for shares settling in cash	$ 0.7				$ 1.2				$ 0.7	1.2
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									$ 3.2	3.7	4.1
Net cash proceeds from the exercise of stock options									32.9	4.3	4.1
Income tax benefits									$ 1.9	$ (0.3)	$ 1.3
Shares distributed									445,036	188,383	103,953
Number of shares available for future grants for all plans	4,920,863								4,920,863
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, Vested in Period, Fair Value									$ 16.5	$ 7.8	$ 3.8
Earnings Per Share, Diluted	$ 0.37	$ 0.68	$ 1.04	$ 0.48	$ (0.09)	$ 0.43	$ 0.61	$ 0.82	$ 2.58	$ 1.78	$ 2.21
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value									$ 10.60	$ 6.49	$ 11.67
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate									1.96%	1.22%	1.58%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate									2.96%	3.04%	2.29%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate									32.25%	34.12%	36.53%
Employee Stock Option [Member]
Share Based Compensation Plans (Textual) [Abstract]
Earnings Per Share, Diluted									$ 0.04	$ 0.05	$ 0.05
Employee Stock Option [Member]
Share Based Compensation Plans (Additional Textual) [Abstract]
Expected life - years									10 years
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	1,245,274				1,349,175				1,245,274	1,349,175
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 37.56				$ 34.96				$ 37.56	$ 34.96
Share Based Compensation Plans (Additional Textual) [Abstract]
Canceled or expired, Number of Shares									(66,301)
Shares awarded									407,436	613,165	485,975
Recognized Stock-based compensation expense before tax									$ 19.5	$ 8.2	$ 11.8
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Option Forfeited in Period Weighted Average Grant Date Fair Value									$ 35.96
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value									$ 45.48
Share Based Compensation Plans (Textual) [Abstract]
Vested, Number of shares									(445,036)
Vested, Weighted-average Grant Date Fair Value									$ 37.18
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Plans (Additional Textual) [Abstract]
Shares awarded									191,256
Vesting period									3 years
Shares expected to settle in cash	4,200								4,200
Shares expected to settle in shares	187,056								187,056
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage									25.00%
Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share Based Compensation Plans (Additional Textual) [Abstract]
Vesting period									5 years
Performance Shares [Member]
Share Based Compensation Plans (Additional Textual) [Abstract]
Shares awarded									226,640
Shares expected to settle in cash	6,260								6,260
Shares expected to settle in shares	220,380								220,380