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Significant Accounting Policies (Details 7)
€ in Millions, ¥ in Millions, $ in Millions
3 Months Ended
Jun. 30, 2015
EUR (€)
DerivativeInstrument
Jun. 30, 2015
USD ($)
DerivativeInstrument
item
Jun. 30, 2015
JPY (¥)
DerivativeInstrument
item
Jun. 30, 2015
EUR (€)
DerivativeInstrument
item
Dec. 31, 2014
USD ($)
DerivativeInstrument
Dec. 31, 2014
JPY (¥)
DerivativeInstrument
Sep. 30, 2014
EUR (€)
Derivative financial instruments              
Number of credit-risk-related hedging or derivative activities | item   0 0 0      
Gross accumulated other comprehensive income or loss related to derivative activities   $ 21.2     $ 45.8    
Interest rate swap | Designated as Hedging Instrument              
Derivative financial instruments              
Number of Instruments | DerivativeInstrument   2 2 2 2 2  
Notional Amount   $ 375.0     $ 375.0    
Interest rate net, fair value   0.9     (1.2)    
Interest rate swap | Deferred costs and other assets | Designated as Hedging Instrument              
Derivative financial instruments              
Interest rate derivative asset, fair value   1.6     0.9    
Interest rate swap | Other liabilities. | Designated as Hedging Instrument              
Derivative financial instruments              
Interest rate derivative liabilities, fair value   0.6     2.1    
USD-Yen currency forward contract | Designated as Hedging Instrument              
Derivative financial instruments              
Notional Amount | ¥     ¥ 0.0     ¥ 14.7  
USD-Yen currency forward contract | Deferred costs and other assets | Designated as Hedging Instrument              
Derivative financial instruments              
Forward contract net, fair value         0.1    
USD-Euro currency forward contract | Designated as Hedging Instrument              
Derivative financial instruments              
Number of contracts settled | DerivativeInstrument 1            
Notional contract settled during period | € € 50.0            
Notional Amount | €       € 100.0     € 150.0
USD-Euro currency forward contract | Deferred costs and other assets | Designated as Hedging Instrument              
Derivative financial instruments              
Forward contract net, fair value   $ 22.9     $ 19.1