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Employee Benefit and Retirement Plans - Composition of Domestic Pension Plan Assets (Detail) - United States [Member] - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Global Equities [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets $ 179.8 $ 294.3
Global Equities [Member] | Fair Value [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets   205.3
Global Equities [Member] | Portion at Other than Fair Value Measurement [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 179.8 89.0
Fixed Income Securities [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 682.6 602.9
Fixed Income Securities [Member] | Fair Value [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 413.3 395.4
Fixed Income Securities [Member] | Portion at Other than Fair Value Measurement [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 269.3 207.5
Alternative Investments [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 217.8 173.7
Alternative Investments [Member] | Fair Value [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 40.7 23.8
Alternative Investments [Member] | Portion at Other than Fair Value Measurement [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 177.1 149.9
Cash and Other Investments [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 24.7 200.2
Cash and Other Investments [Member] | Fair Value [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 24.7 200.2
Fair Value Of Plan Assets [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 1,104.9 1,271.1
Fair Value Of Plan Assets [Member] | Fair Value [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 478.7 824.7
Fair Value Of Plan Assets [Member] | Portion at Other than Fair Value Measurement [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 626.2 446.4
Level 1 [Member] | Global Equities [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets   205.3
Level 1 [Member] | Fixed Income Securities [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 413.3 395.4
Level 1 [Member] | Alternative Investments [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 40.7 23.8
Level 1 [Member] | Cash and Other Investments [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 8.9 183.9
Level 1 [Member] | Fair Value Of Plan Assets [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 462.9 808.4
Level 2 [Member] | Cash and Other Investments [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 14.8 15.2
Level 2 [Member] | Fair Value Of Plan Assets [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 14.8 15.2
Level 3 [Member] | Cash and Other Investments [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets 1.0 1.1
Level 3 [Member] | Fair Value Of Plan Assets [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined benefit plan, fair value of plan assets $ 1.0 $ 1.1