Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Fair Value Measurements [Abstract]

Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]

The following table presents the Company’s fair value hierarchy for those assets and liabilities measured at fair value on a recurring basis as of December 31, 2017:

In Millions	Fair Value		Fair value measurements
			Level 1		Level 2		Level 3
Assets:
Derivative instruments	$	7.2	$	—	$	7.2	$	—
Liabilities:
Derivative instruments	$	2.5	$	—	$	2.5	$	—

The following table presents the Company’s fair value hierarchy for those assets and liabilities measured at fair value on a recurring basis as of December 31, 2016:

In Millions	Fair Value		Fair value measurements
			Level 1		Level 2		Level 3
Assets:
Derivative instruments	$	0.6	$	—	$	0.6	$	—
Liabilities:
Derivative instruments	$	20.8	$	—	$	20.8	$	—