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Stock Compensation Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Current Fiscal Year End Date									--12-31
Document Period End Date									Dec. 31, 2019
Document Fiscal Year Focus									2019
Share Based Compensation Plans (Additional Textual) [Abstract]
Expected life - years									5 years	5 years	5 years
Total intrinsic value of options exercised									$ 13.4	$ 6.7	$ 14.7
Unrecognized Compensation expense related to stock option awards, restricted shares and deferred shares	$ 30.0								30.0
Recognized Stock-based compensation expense before tax									4.9	4.8	5.2
Amount accrued for shares settling in cash	$ 1.1				$ 0.8				$ 1.1	0.8
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	3.7	3.2
Net cash proceeds from the exercise of stock options									$ 27.5	$ 12.8	$ 32.9
Shares distributed									539,396	290,287	445,036
Number of shares available for future grants for all plans	10,000,000								10,000,000
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									$ 17.3	$ 11.8	$ 16.5
Earnings Per Share, Diluted	$ 1.48	$ 0.84	$ 1.20	$ 1.19	$ 0.77	$ 0.91	$ 1.16	$ 1.02	$ 4.71	$ 3.86	$ 2.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value									$ 9.58	$ 10.29	$ 10.60
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate									2.46%	2.62%	1.96%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate									2.52%	2.30%	2.96%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate									28.29%	27.78%	32.25%
Share-based Payment Arrangement, Option [Member]
Share Based Compensation Plans (Textual) [Abstract]
Earnings Per Share, Diluted									$ 0.05	$ 0.05	$ 0.04
Share-based Payment Arrangement, 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	1,106,724				1,196,492				1,106,724	1,196,492
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 43.13				$ 38.76				$ 43.13	$ 38.76
Share Based Compensation Plans (Additional Textual) [Abstract]
Canceled or expired, Number of Shares									(19,304)
Shares awarded									468,932	388,525	407,436
Recognized Stock-based compensation expense before tax									$ 22.3	$ 27.5	$ 19.5
Shares expected to settle in cash	161,405								161,405
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Option Forfeited in Period Weighted Average Grant Date Fair Value									$ 43.31
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value									$ 41.57
Share Based Compensation Plans (Textual) [Abstract]
Vested, Number of shares									(539,396)
Vested, Weighted-average Grant Date Fair Value									$ 32.08
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Plans (Additional Textual) [Abstract]
Vesting period									3 years
Shares expected to settle in cash	3,940								3,940
Shares expected to settle in shares	157,465								157,465
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage									25.00%
Performance Shares [Member]
Share Based Compensation Plans (Additional Textual) [Abstract]
Shares awarded									303,838
Shares expected to settle in cash	7,241								7,241
Shares expected to settle in shares	296,597								296,597