CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018		Sep. 30, 2019		Sep. 30, 2018
Pension and other postretirement plans adjustments:
Amortization of prior service cost, income tax expense	$ 0.0	$ 0.0	[1]	$ 0.0		$ 0.1	[1]
Amortization of net actuarial loss, income tax expense	0.0	(0.1)		0.0		0.1	[2]
Net curtailment (gain) loss, tax	$ 0.0	$ 0.0		$ 0.1	[3]	$ 0.0

[1] Presented net of income tax expense of $0.1 million for the nine months ended September 30, 2018.

[2] Presented net of income tax benefit of $0.1 million and expense of $0.1 million for the three and nine months ended September 30, 2018, respectively.

[3] Presented net of income tax benefit of $0.1 million for the nine months ended September 30, 2019