Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair value assets and liabilities measured on a recurring basis

Assets and liabilities measured at fair value on a recurring basis are presented below:

	2017								2016
	Level 1		Level 2			Total			Level 1		Level 2			Total
Assets measured at fair value
Cash and cash equivalents (a)	$	38.0	$	—		$	38.0		$	48.2	$	125.0		$	173.2
Other current assets:
Foreign exchange contracts	—		0.2			0.2			—		0.1			0.1
Commodity hedge contracts	—		35.2			35.2			—		47.0			47.0
Other non-current assets:
Foreign exchange contracts	—		1.7			1.7			—		—			—
Commodity hedge contracts	—		10.6			10.6			—		15.3			15.3
Assets measured at fair value	$	38.0	$	47.7		$	85.7		$	48.2	$	187.4		$	235.6
Liabilities measured at fair value
Accrued liabilities:
Foreign exchange contracts	$	—	$	(0.3	)	$	(0.3	)	$	—	$	—		$	—
Commodity hedge contracts	—		(4.9		)	(4.9		)	—		(1.8		)	(1.8		)
Other non-current liabilities—commodity hedge contracts	—		(0.5		)	(0.5		)	—		(0.6		)	(0.6		)
Liabilities measured at fair value	$	—	$	(5.7	)	$	(5.7	)	$	—	$	(2.4	)	$	(2.4	)
Liabilities measured at other than fair value
Long-term debt, including current portions:
Fair value	$	—	$	(2,273.4	)	$	(2,273.4	)	$	—	$	(2,123.2	)	$	(2,123.2	)
Carrying amount	—		(2,110.1		)	(2,110.1		)	—		(1,816.6		)	(1,816.6		)

(a) Level 2 assets include money market mutual funds invested in U.S. Treasury obligations.