Non-operating Income (Expense) (Tables)

6 Months Ended

Jun. 30, 2020

Nonoperating Income (Expense) [Abstract]

Schedule of Other Nonoperating Income (Expense) [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Interest expense	$	(11.5)	$	(12.7)	$	(23.7)	$	(24.6)
Capitalized interest	—		2.0		—		5.4
Amortization of debt issuance costs	(0.5)		(0.4)		(1.1)		(0.9)
Interest income	—		0.3		—		0.7
Interest expense, net	(12.0)		(10.9)		(24.9)		(19.4)
Debt retirement costs	(1.0)		—		(1.0)		—
Non-operating pension and other postretirement employee benefits income (expense)	(2.0)		(1.5)		(3.8)		(2.8)
Total non-operating expense	$	(14.9)	$	(12.4)	$	(29.6)	$	(22.2)