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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Net Investment In Foreign Operations Hedges $ 113.7 $ 161.6  
Derivative Instruments, Gain Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing 2.0 $ 0.4 $ 0.8
Interest Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net (0.8)    
Investment Income [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net $ 0.7