Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Long-Term Debt

December 31 (in millions)	2019			2018
4.25% Senior Notes, due 2024	$	397.0		$	396.4
7% Debentures, due 2025		124.4			124.3
3.450% Senior Notes, due 2027		297.3			296.9
3.500% Senior Notes, due 2027		495.3			494.8
6.25% Senior Notes, due 2037		228.1			228.1
4.250% Senior Notes, due 2047		591.7			591.5
Floating Rate Senior Notes, due 2020, interest rate of 2.55%    and 3.30% at December 31, 2019 and 2018, respectively		299.7			299.0
Floating Rate Senior Notes, due 2019, interest rate of    3.29% at December 31, 2018		—			299.2
Trade Receivable Facility, interest rate of 2.42% and 3.07% at December 31,    2019 and 2018, respectively		340.0			390.0
Other notes		0.1			0.2
Total		2,773.6			3,120.4
Less: current maturities		(340.0	)		(390.0	)
Long-term debt	$	2,433.6		$	2,730.4

Schedule of Principal Amount, Effective Interest Rate and Maturity Date for Corporation's Senior Notes

	Principal Amount (in millions)		Effective Interest Rate	Maturity Date
4.25% Senior Notes	$	400.0	4.25%	July 2, 2024
7% Debentures	$	125.0	7.12%	December 1, 2025
3.450% Senior Notes	$	300.0	3.47%	June 1, 2027
3.500% Senior Notes	$	500.0	3.53%	December 15, 2027
6.25% Senior Notes	$	230.0	6.45%	May 1, 2037
4.250% Senior Notes	$	600.0	4.27%	December 15, 2047
Floating Rate Senior Notes, due 2020	$	300.0	Three-month LIBOR + 0.65%	May 22, 2020

Schedule of Corporation's Long-Term Debt Maturities

The Company’s long-term debt maturities for the five years following December 31, 2019, and thereafter are:  

(in millions)
2020	$	340.0
2021		0.1
2022		0.1
2023		—
2024		696.7
Thereafter		1,736.7
Total	$	2,773.6