Derivatives and Fair Value Measurements (Details 3) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Diesel fuel hedge contracts [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Derivative assets (liabilities), at fair value, net	$ (28.7)
Foreign currency cash flow hedge contract [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Derivative assets (liabilities), at fair value, net	(315.0)
Fair Value, Measurements, Recurring [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Investments in debt and equity securities	62.0	67.0
Total net financial assets (liabilities)	(281.7)	(401.2)
Fair Value, Measurements, Recurring [Member] | Commodity swaps and options [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Derivative assets (liabilities), at fair value, net	(28.7)	5.1
Fair Value, Measurements, Recurring [Member] | Foreign currency cash flow hedge contract [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Derivative assets (liabilities), at fair value, net	(315.0)	(473.3)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Investments in debt and equity securities	27.1	28.8
Total net financial assets (liabilities)	27.1	28.8
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commodity swaps and options [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Derivative assets (liabilities), at fair value, net	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Foreign currency cash flow hedge contract [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Derivative assets (liabilities), at fair value, net	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Investments in debt and equity securities	34.9	38.2
Total net financial assets (liabilities)	(308.8)	(430.0)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commodity swaps and options [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Derivative assets (liabilities), at fair value, net	(28.7)	5.1
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign currency cash flow hedge contract [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Derivative assets (liabilities), at fair value, net	(315.0)	(473.3)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Investments in debt and equity securities	0	0
Total net financial assets (liabilities)	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Commodity swaps and options [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Derivative assets (liabilities), at fair value, net	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Foreign currency cash flow hedge contract [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Derivative assets (liabilities), at fair value, net	$ 0	$ 0