Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Notes Payable 4.5 Percent Due 2021 [Member]	Jun. 30, 2014 Derivatives not designated as hedging instruments Forward exchange contracts	Dec. 31, 2013 Derivatives not designated as hedging instruments Forward exchange contracts	Jun. 30, 2014 Designated as Hedging Instrument [Member] Interest-rate swap	Jun. 30, 2014 (Level 2) Measured on a recurring basis Interest-rate swap	Dec. 31, 2013 (Level 2) Measured on a recurring basis Interest-rate swap
Derivative Instruments
Maximum Remaining Maturity of Foreign Currency Derivatives	6 months
Derivative Liabilities						$ 5.3	$ 20.2
Notional amounts of derivatives			11.8	5.5	400.0
Number of swap agreements					4
Debt instrument, face amount		$ 400
Fixed-rate (as a percent)		4.50%