Subsequent Events (Details) In Millions, except Per Share data, unless otherwise specified	12 Months Ended			1 Months Ended		3 Months Ended		6 Months Ended			0 Months Ended	1 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 Not Designated as Hedging Instrument [Member] Foreign Currency Forward Contracts [Member] USD ($)	Dec. 31, 2014 Not Designated as Hedging Instrument [Member] Foreign Currency Forward Contracts [Member] MXN	Mar. 31, 2014 Not Designated as Hedging Instrument [Member] Foreign Currency Forward Contracts [Member] USD ($)	Mar. 31, 2014 Not Designated as Hedging Instrument [Member] Foreign Currency Forward Contracts [Member] MXN	Jun. 30, 2013 Not Designated as Hedging Instrument [Member] Foreign Currency Forward Contracts [Member] USD ($)	Jun. 30, 2013 Not Designated as Hedging Instrument [Member] Foreign Currency Forward Contracts [Member] MXN	Dec. 31, 2013 Not Designated as Hedging Instrument [Member] Foreign Currency Forward Contracts [Member] USD ($)	Jan. 29, 2015 Subsequent Event [Member] USD ($)	Jan. 31, 2015 Subsequent Event [Member] Not Designated as Hedging Instrument [Member] Foreign Currency Forward Contracts [Member] USD ($)	Jan. 31, 2015 Subsequent Event [Member] Not Designated as Hedging Instrument [Member] Foreign Currency Forward Contracts [Member] MXN
Foreign Currency Hedging [Abstract]
Aggregate notional amount of foreign currency forward contracts				$ 300.0	4,364.7	$ 345.0	4,642.5	$ 325.0	4,202.3	$ 0		$ 300.0	4,480.4
Foreign currency forward contracts maturity date				Jan. 15, 2015	Jan. 15, 2015	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013			Jan. 15, 2016	Jan. 15, 2016
Weighted average exchange rate of foreign currency forward contracts (in Ps per USD)					14.55		13.46		12.93				14.93
Common Stock Dividend [Abstract]
Cash dividends declared per common share	$ 1.12	$ 0.86	$ 0.78								$ 0.33
Aggregate amount of dividends on common stock	$ 123.6	$ 94.8	$ 85.9								$ 36.4