Stock-Based Compensation (Narrative) (Details) $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 01, 2019	Jan. 31, 2018	Dec. 31, 2018	Dec. 31, 2019 USD ($) company stock-based_retirement_plan shares	Dec. 31, 2018	Dec. 31, 2017	May 10, 2012 shares	May 09, 2012 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock units per common share | shares				1
Expected life in years				7 years 9 months 18 days	6 years	6 years
Stock units converted to common stock ratio				1-to-1
Options Granted On A Discretionary Basis
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life in years				10 years
Vesting period				3 years
GPSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance measurement period						2 years
Deferred Stock Compensation Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life in years				10 years
Vesting period				15 months
Discount to the market price, percentage				20.00%
Time period for receiving plan distributions, max				10 years
Time period for installment distributions, max				10 years
Stock-based retirement plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based retirement plans | stock-based_retirement_plan				2
Automatic employer match, percentage				50.00%
Additional employer match upon certain profitability levels, percentage				50.00%
Discount market price purchase date, percentage				85.00%
Performance Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Measurement performance period, years				3 years
Percentage of award intended to pay out in stock				50.00%	65.00%
Percentage of award intended to pay out in cash				50.00%	35.00%
Reserved percentage of award intended to pay out in cash			100.00%	100.00%	100.00%
Awards based on TSR compared to peer group (as a percent)				50.00%
Awards based upon relative TSR for certain business unit employees (as a percent)				100.00%
Number of companies forming peer group | company				300
Performance Stock Unit Awards - EBIT CAGR Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Measurement performance period, years		2 years		3 years
Award based on EBIT CAGR (as a percent)				50.00%
Average payout percentage of base award				114.00%
Total shares base award | shares				100,000
Cash paid				$ 4.1
Discount Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount to the market price, percentage				85.00%
Measurement performance period, years				1 year
ESUP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				5 years
Prior PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved percentage of award intended to pay out in cash					175.00%
Esup
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Based Retirement Plans Employee Contributions				$ 3.7
Employer Premium Contribution To Diversified Investment Accounts				$ 0.6
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Award vesting percentage				33.00%
Maximum | GPSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage						250.00%
Maximum | Stock-based retirement plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SBP participant contribution for stock or other investment purchases	20.00%
SBP merged with 401(k), participant contribution (as a percent)				100.00%
ESUP participant contribution for stock or other investment purchases				10.00%
Premium contributions for ESUP participants				17.65%
Maximum | Performance Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Base award percentage of total shareholder return				200.00%	200.00%	175.00%
Maximum | Performance Stock Unit Awards - EBIT CAGR Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Base award percentage of total shareholder return				200.00%
Minimum | GPSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage						0.00%
Minimum | Performance Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Base award percentage of total shareholder return				0.00%
Minimum | Performance Stock Unit Awards - EBIT CAGR Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Base award percentage of total shareholder return				0.00%
Flexible Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares against plan | shares							3	1
Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized cost of non-vested stock				$ 11.3
Weighted-average remaining contractual life				1 year