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Share-Based Compensation (Summary Of Compensation Expense) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-Based Compensation Arrangement By Share-based Payment Award [Line Items]      
Share-based compensation $ 14.2us-gaap_ShareBasedCompensation $ 16.5us-gaap_ShareBasedCompensation $ 10.4us-gaap_ShareBasedCompensation
Stock appreciation rights      
Share-Based Compensation Arrangement By Share-based Payment Award [Line Items]      
Share-based compensation 5.5us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 6.1us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 5.1us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Performance Shares [Member]      
Share-Based Compensation Arrangement By Share-based Payment Award [Line Items]      
Share-based compensation 0.7us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 0.3us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 0us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Restricted stock units      
Share-Based Compensation Arrangement By Share-based Payment Award [Line Items]      
Share-based compensation $ 8.0us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 $ 10.1us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 $ 5.3us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember