CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019		Jun. 30, 2018
Amortization of prior service cost, tax expense	[1]		$ 0.1			$ 0.1
Pension and other postretirement plans adjustments:
Amortization of net actuarial loss, income tax expense		$ 0.0	0.1	$ 0.0		0.2	[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 and $0.1 million for the three and six months ended June 30, 2018, respectively.

[2] Presented net of income tax expense of $0.1 million and $0.2 million for the three and six months ended June 30, 2018, respectively.

[3] Presented net of income tax expense of $0.1 million for the six months ended June 30, 2019, respectively.