Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Current Deferred Taxes [Abstract]
Reserves and accruals	$ 0.0	$ 9.7
Inventories	0.0	22.2
Derivatives and hedging	0.0	(11.6)
Valuation allowance	0.0	(0.1)
Total current deferred tax assets	0.0	20.2
Non-Current Deferred Taxes [Abstract]
Property, plant and equipment, and intangibles	(288.6)	(251.6)
Partnership and equity investments	(7.6)	(16.3)
Deferred revenues	(12.6)	(13.8)
Derivatives and hedging	19.9	0.0
Compensation and employee benefits	9.4	7.1
Net operating loss carryforwards	6.7	6.2
Reserves and accruals	11.4	4.9
Inventories	19.2	0.0
Valuation allowance	(5.7)	(2.8)
Total non-current deferred tax liabilities	(247.9)	(266.3)
Total net deferred tax liabilities	$ (247.9)	$ (246.1)