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Components of Net Periodic Benefit Cost (Tables)

6 Months Ended

Jun. 30, 2020

Components of net periodic benefit cost [Abstract]

Schedule of net periodic benefit cost


			Pension Benefits
			Three months ended June 30,																		Six months ended June 30,
			2020						2019						2020						2019
Service cost			$	1.1					$	0.5					$	2.4					$	1.5
Interest cost			2.8						3.4						5.6						6.7
Expected return on plan assets			(5.2)						(4.3)						(10.3)						(9.1)
Amortization of prior service costs			0.0						0.5						0.0						0.5
Amortization of net loss			1.8						2.2						3.3						3.3
Net periodic benefit cost			$	0.5					$	2.3					$	1.0					$	2.9


			Other Postretirement Benefits ("OPEB")
			Three months ended June 30,																		Six months ended June 30,
			2020						2019						2020						2019
Service cost			$	0.1					$	0.7					$	0.2					$	0.7
Interest cost			0.7						1.2						1.5						2.3
Amortization of prior service cost			(0.8)						(1.8)						(1.6)						(3.1)
Amortization of net loss			0.1						0.4						1.1						1.1
Net periodic benefit cost			$	0.1					$	0.5					$	1.2					$	1.0