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Stock-based Compensation (Schedule of Restricted Stock Unit Two-Year Performance Cycle) (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Award Year 2015      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average Payout as a Percent of the Base Award     36.00%
Estimated Number of Shares (in shares) (less than)     0.1
Cash Portion     $ 0.8
Award Year 2016      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average Payout as a Percent of the Base Award   44.00%  
Estimated Number of Shares (in shares) (less than)   0.0  
Cash Portion   $ 2.0  
Award Year 2017      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average Payout as a Percent of the Base Award 155.00%    
Estimated Number of Shares (in shares) (less than) 0.1    
Cash Portion $ 2.2