Commitments (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Schedule of commitments and contingencies

A schedule of future minimum long-term purchase commitments, based on December 31, 2015 market prices, and minimum lease payments under non-cancelable operating leases as of December 31, 2015 is as follows:

(in millions)	Purchase Commitments		Operating Leases
2016	$	1,933.2	$	53.5
2017	483.0		46.1
2018	329.8		35.1
2019	297.0		27.7
2020	286.1		24.1
Subsequent years	2,964.2		72.2
	$	6,293.3	$	258.7