Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2018

Compensation And Retirement Disclosure [Abstract]

Components of Net Pension Expense

The following information details the components of net pension expense for the Company’s defined benefit plans:

	Three Months Ended						Six Months Ended
	June 30						June 30
	2018			2017			2018			2017
Service cost	$	26.0		$	22.2		$	54.7		$	46.0
Interest on projected benefit obligation		21.7			20.0			43.0			40.4
Expected return on assets		(44.5	)		(39.6	)		(89.3	)		(79.4	)
Amortization of prior service costs		.3			.3			.7			.6
Recognized actuarial loss		10.1			5.9			17.8			12.6
Net pension expense	$	13.6		$	8.8		$	26.9		$	20.2