Fair Value Measurements (Details) (USD $)	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long-term debt	$ 281,600,000		$ 262,600,000
Carrying amount of long term debt	275,000,000
Foreign currency forward contracts, gross notional value	1,900,000,000		2,000,000,000
Foreign currency forward contracts, net notional value	935,600,000		1,000,000,000
Foreign Exchange Contracts, Fair Value Gain (loss)	(17,200,000)	7,200,000
Deferred compensation plan, contra-equity, shares held in trust	6,400,000		8,100,000
Fair value of investments	101,000,000	75,100,000	78,900,000	63,600,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan liabilities	104,400,000		85,900,000
Foreign currency forward contract, current asset amount	12,700,000		13,000,000
Deferred compensation plan assets	108,500,000		85,100,000
Foreign currency forward contract, current liability amount	29,900,000		13,100,000
Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	15,500,000		13,800,000
Derivative Asset, Fair Value, Gross Liability	2,800,000		800,000
Derivative Liability, Fair Value, Gross Liability	31,300,000		14,400,000
Derivative Liability, Fair Value, Gross Asset	$ 1,400,000		$ 1,300,000