Employee Benefit Plans (Fair Values of Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,366.4	$ 1,354.6
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	65.0	51.8
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	551.1	613.4
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	616.9	592.0
Assets held by insurance companies and other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	133.4	97.4
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	338.6	493.1
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	63.1	51.2
Level 1 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	53.9	145.3
Level 1 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	211.4	292.6
Level 1 | Assets held by insurance companies and other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10.2	4.0
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	946.2	788.1
Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.9	0.6
Level 2 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	497.2	468.1
Level 2 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	405.5	299.4
Level 2 | Assets held by insurance companies and other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	41.6	20.0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	81.6	73.4
Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Level 3 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Level 3 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Level 3 | Assets held by insurance companies and other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 81.6	$ 73.4