Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans - Fair Values of Pension Plan Assets, by Asset Category and Level of Fair Values (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 762.0	$ 668.7
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.9	3.5
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	323.1	275.6
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	180.2	150.1
NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	256.8	239.5
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	43.4	36.5
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.9	3.5
Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	41.5	33.0
Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Cash and cash equivalents | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	323.8	283.4
Fixed income funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Fixed income funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	210.2	150.6
Fixed income funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Fixed income funds | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	113.6	132.8
Equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	146.9	147.1
Equity funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Equity funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	61.5	81.1
Equity funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Equity funds | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	85.4	66.0
Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	247.9	201.7
Other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9.9	10.9
Other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	180.2	150.1
Other | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 57.8	$ 40.7