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Financial Instruments (Narrative) (Details)
₨ in Millions, PHP in Millions, COP in Millions, CAD in Millions, AUD in Millions, $ in Millions
3 Months Ended
Jun. 30, 2017
AUD
Jun. 30, 2017
INR (₨)
Jun. 30, 2017
COP
Jun. 30, 2017
CAD
Jun. 30, 2017
USD ($)
Jun. 30, 2017
PHP
Jun. 30, 2016
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Derivatives                      
Derivative Instruments Not Designated as Hedging Instruments, Loss         $ (12.0)            
Derivative, Notional Amount         964.9       $ 959.0    
Deferred Tax Assets, Derivative Instruments         $ 6.1       15.9    
Derivative instruments maturity period (in months) 33 months 33 months 33 months 33 months 33 months 33 months          
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax         $ 9.8   $ 11.0 $ 14.8 25.5 $ 4.1 $ 26.1
Deferred gain on derivative instruments reclassified from OCI to earnings during the next the next twelve months, before tax         (12.5)            
Deferred gain on derivative instruments reclassified from OCI to earnings during next twelve months, net of tax         (7.7)            
Derivative Instruments Not Designated as Hedging Instruments, Gain             $ 1.0        
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value         3.0            
Trading Securities, Fair Value Disclosure         12.2       $ 12.4    
Forward Contracts PHP [Member]                      
Derivatives                      
Foreign currency acquired through forward exchange contracts | PHP           PHP 36,765.0          
Derivative, Notional Amount         745.4            
Forward Contracts INR [Member]                      
Derivatives                      
Foreign currency acquired through forward exchange contracts | ₨   ₨ 12,435.0                  
Derivative, Notional Amount         171.0            
Forward Contracts CAD [Member]                      
Derivatives                      
Foreign currency acquired through forward exchange contracts | CAD       CAD 54.8              
Derivative, Notional Amount         41.5            
Forward Contracts COP [Member]                      
Derivatives                      
Foreign currency acquired through forward exchange contracts | COP     COP 28,200.0                
Derivative, Notional Amount         8.9            
Forward Contracts AUD [Member]                      
Derivatives                      
Derivative, Notional Amount         $ 13.4            
Amount of Foreign Currency Sold through Forward Exchange Contracts | AUD AUD 18.0