Derivative Instruments Summary of Foreign Currency Derivative Contracts (Details) MXN in Millions, $ in Millions						1 Months Ended	6 Months Ended
		Apr. 25, 2017 USD ($)	Jan. 17, 2017 USD ($)	Apr. 29, 2016 USD ($)	Jan. 15, 2016 USD ($)	Feb. 28, 2017 USD ($)	Jun. 30, 2017 USD ($) MXN / $	Jun. 30, 2016 USD ($)	Jan. 17, 2017 MXN MXN / $	Jan. 17, 2017 USD ($) MXN / $	Apr. 29, 2016 MXN MXN / $	Apr. 29, 2016 USD ($) MXN / $	Jan. 15, 2016 MXN MXN / $	Jan. 15, 2016 USD ($) MXN / $
Derivative [Line Items]
Cash received/(paid) on settlement of foreign currency contracts							$ (23.7)	$ (58.4)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts									MXN 6,207.7	$ 340.0	MXN 1,057.3	$ 60.0	MXN 4,480.4	$ 300.0
Weighted-average exchange rate of foreign currency forward contracts | MXN / $									18.3	18.3	17.6	17.6	14.9	14.9
Maturity date of foreign currency contracts			Jan. 17, 2017	Apr. 29, 2016	Jan. 15, 2016
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Foreign Exchange Gain (Loss) [Member]
Derivative [Line Items]
Cash received/(paid) on settlement of foreign currency contracts			$ (53.0)	$ 0.7	$ (49.0)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Offsetting Derivative Instrument [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts									MXN 6,207.7	$ 287.0	MXN 1,057.3	$ 60.7	MXN 4,480.4	$ 251.0
Weighted-average exchange rate of foreign currency forward contracts | MXN / $									21.6	21.6	17.4	17.4	17.9	17.9
Maturity date of foreign currency contracts			Jan. 17, 2017	Apr. 29, 2016	Jan. 15, 2016
Not Designated as Hedging Instrument [Member] | Foreign Currency Zero-Cost Collar Contracts [Member] | Zero-Cost Collar Contracts Maturing July 27, 2017 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts							$ 70.0
Maturity date of foreign currency contracts							Jul. 27, 2017
Not Designated as Hedging Instrument [Member] | Foreign Currency Zero-Cost Collar Contracts [Member] | Zero-Cost Collar Contracts Maturing July 27, 2017 [Member] | Call Option [Member]
Derivative [Line Items]
Weighted-average rate outstanding options | MXN / $							18.8
Not Designated as Hedging Instrument [Member] | Foreign Currency Zero-Cost Collar Contracts [Member] | Zero-Cost Collar Contracts Maturing July 27, 2017 [Member] | Put Option [Member]
Derivative [Line Items]
Weighted-average rate outstanding options | MXN / $							19.4
Not Designated as Hedging Instrument [Member] | Foreign Currency Zero-Cost Collar Contracts [Member] | Zero-Cost Collar Contracts Maturing January 16, 2018 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts							$ 255.0
Maturity date of foreign currency contracts							Jan. 16, 2018
Notional amount of zero-cost collar contracts settled by the Company						$ 115.0
Not Designated as Hedging Instrument [Member] | Foreign Currency Zero-Cost Collar Contracts [Member] | Zero-Cost Collar Contracts Maturing January 16, 2018 [Member] | Call Option [Member]
Derivative [Line Items]
Weighted-average rate outstanding options | MXN / $							21.5
Not Designated as Hedging Instrument [Member] | Foreign Currency Zero-Cost Collar Contracts [Member] | Zero-Cost Collar Contracts Maturing January 16, 2018 [Member] | Put Option [Member]
Derivative [Line Items]
Weighted-average rate outstanding options | MXN / $							24.6
Not Designated as Hedging Instrument [Member] | Foreign Currency Zero-Cost Collar Contracts [Member] | Zero-Cost Collar Contracts Maturing January 16, 2018 [Member] | Foreign Exchange Gain (Loss) [Member]
Derivative [Line Items]
Cash received/(paid) on settlement of foreign currency contracts	[1]					$ 3.5
Not Designated as Hedging Instrument [Member] | Foreign Currency Zero-Cost Collar Contracts [Member] | Zero-Cost Collar Contracts Maturing January 18, 2018 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts							$ 10.0
Maturity date of foreign currency contracts							Jan. 18, 2018
Not Designated as Hedging Instrument [Member] | Foreign Currency Zero-Cost Collar Contracts [Member] | Zero-Cost Collar Contracts Maturing January 18, 2018 [Member] | Call Option [Member]
Derivative [Line Items]
Weighted-average rate outstanding options | MXN / $							18.8
Not Designated as Hedging Instrument [Member] | Foreign Currency Zero-Cost Collar Contracts [Member] | Zero-Cost Collar Contracts Maturing January 18, 2018 [Member] | Put Option [Member]
Derivative [Line Items]
Weighted-average rate outstanding options | MXN / $							20.7
Not Designated as Hedging Instrument [Member] | Foreign Currency Zero-Cost Collar Contracts [Member] | Zero-Cost Collar Contracts Maturing April 25, 2017 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts		$ 195.0
Maturity date of foreign currency contracts		Apr. 25, 2017
Not Designated as Hedging Instrument [Member] | Foreign Currency Zero-Cost Collar Contracts [Member] | Zero-Cost Collar Contracts Maturing April 25, 2017 [Member] | Foreign Exchange Gain (Loss) [Member]
Derivative [Line Items]
Cash received/(paid) on settlement of foreign currency contracts		$ 25.8
Not Designated as Hedging Instrument [Member] | Foreign Currency Zero-Cost Collar Contracts [Member] | Zero-Cost Collar Contracts Maturing January 15, 2016 [Member]
Derivative [Line Items]
Notional amount of foreign currency contracts														$ 80.0
Maturity date of foreign currency contracts					Jan. 15, 2016
Not Designated as Hedging Instrument [Member] | Foreign Currency Zero-Cost Collar Contracts [Member] | Zero-Cost Collar Contracts Maturing January 15, 2016 [Member] | Foreign Exchange Gain (Loss) [Member]
Derivative [Line Items]
Cash received/(paid) on settlement of foreign currency contracts					$ (10.1)

[1] During February 2017, the Company settled $115.0 million of the zero-cost collar contracts.