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Changes in Accumulated Other Comprehensive Loss (Schedule of Reclassifications from Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of revenues $ 2,610.0 $ 2,302.6 $ 2,076.9
Other income and expense (0.6) 7.7 $ (4.4)
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total reclassifications 0.2 (11.8)  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of revenues 0.2 (7.7)  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other income and expense $ 0.0 $ (4.1)