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Incentive Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 09, 2018
Mar. 01, 2018
Feb. 20, 2018
Feb. 06, 2018
Feb. 28, 2018
Mar. 31, 2018
Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Threshold of deductible compensation for executive officers             $ 1.0
2012 Long-Term Plan [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Long term plan expiration year             2022
Maximum number of shares available for issuance             8,700,000
Maximum number of shares available for issuance, annual rate             1.00%
Performance-Based RSUs [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Grants in period           905,500  
Stock-based compensation, fair value assumption model             Monte Carlo valuation model
Performance-Based RSUs [Member] | Minimum [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Fair value per share at grant date           $ 28.27  
Performance-Based RSUs [Member] | Maximum [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Fair value per share at grant date           $ 30.56  
Time-Based RSUs [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Grants in period           736,000  
Fair value per share at grant date   $ 25.69 $ 26.56 $ 28.42      
Time-Based RSUs [Member] | Director [Member] | Non-Employee Director Plan [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Grants in period         77,803    
Fair value per share at grant date         $ 28.28    
Vesting scheme             These units are scheduled to vest on the third anniversary of the date of grant.
Cash-Settled RSUs [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Grants in period 29,000     715,100