Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of financial instrument fair value

The estimated fair value of financial instruments at December 31, 2018 was as follows:

			Fair Value Measurements at Reporting Date Using
(In millions)	Total Carrying Amount		Total Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)
Cash and cash equivalents	$	382.0	$	382.0	$	382.0	$	—
Derivative financial instruments:
Assets	3.4		3.4		—		3.4
Liabilities	10.4		10.4		—		10.4
Debt (a)	1,552.5		1,739.4		1,624.4		115.0

The estimated fair value of financial instruments at December 31, 2017 was as follows:

			Fair Value Measurements at Reporting Date Using
(In millions)	Total Carrying Amount		Total Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)
Cash and cash equivalents	$	141.6	$	141.6	$	141.6	$	—
Derivative financial instruments:
Assets	16.5		16.5		—		16.5
Liabilities	5.5		5.5		—		5.5
Debt (a)	1,553.8		1,853.2		1,736.9		116.3