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Schedule of Plans' Assets (Liabilities) at Fair Value (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Other Postretirement Benefit Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | $ 9.1
Other Postretirement Benefit Plans | Insurance Contracts |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | $ 7.7 | 7.3
Other Postretirement Benefit Plans | Pooled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | 1.8
U.S. Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 3,759.4 | 4,069.7
U.S. Plans | Equity Securities | Common Stock |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1,686.4 | 1,837.4
U.S. Plans | Equity Securities | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 411.9 | 461.6
U.S. Plans | Debt Securities | US And UK Government Securities |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | 176.9
U.S. Plans | Debt Securities | Other Fixed Income |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 974.7 | 1,025.3
U.S. Plans | Debt Securities | Insurance Contracts |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | 17.4
U.S. Plans | Debt Securities | U S Government Securities |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 162.2 |
U.S. Plans | Real Estate |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 37.6 | 34.2
U.S. Plans | Real Estate | Real Estate Investments Trust |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 170.7 | 169.1
U.S. Plans | Other | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 105.3 | 102.1
U.S. Plans | Other | Derivative |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 0.8 | 18.2
U.S. Plans | Other | Private Equity |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 7.6 | 12.8
U.S. Plans | Pooled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 263.1 | 297.2
U.S. Plans | Cash |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1.9 | (1.3)
U.S. Plans | Receivables |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 77.1 | 77.4
U.S. Plans | Payables |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | (139.9) | (158.6)
International Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 2,496.8 | 2,718.9
International Plans | Equity Securities | Common Stock |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 0.6 | 1.6
International Plans | Equity Securities | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 956.1 | 1,054.8
International Plans | Debt Securities | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 905.4 | 991.1
International Plans | Debt Securities | Other Fixed Income |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 248.5 | 330.4
International Plans | Debt Securities | Insurance Contracts |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 120.6 | 135.5
International Plans | Real Estate |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 41.8 | 40.8
International Plans | Real Estate | Real Estate Investments Trust |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 0.7 | 1.3
International Plans | Other | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 188.7 | 136.5
International Plans | Other | Derivative |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 7.0 | 7.2
International Plans | Pooled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | 1.2
International Plans | Cash |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 27.4 | 18.6
International Plans | Payables |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | (0.1)
Fair Value, Inputs, Level 1 | U.S. Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1,952.9 | 2,101.0
Fair Value, Inputs, Level 1 | U.S. Plans | Equity Securities | Common Stock |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1,680.6 | 1,831.6
Fair Value, Inputs, Level 1 | U.S. Plans | Debt Securities | US And UK Government Securities |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | 176.9
Fair Value, Inputs, Level 1 | U.S. Plans | Debt Securities | U S Government Securities |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 162.2 |
Fair Value, Inputs, Level 1 | U.S. Plans | Real Estate | Real Estate Investments Trust |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 170.7 | 169.1
Fair Value, Inputs, Level 1 | U.S. Plans | Other | Derivative |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 0.3 | 5.9
Fair Value, Inputs, Level 1 | U.S. Plans | Cash |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1.9 | (1.3)
Fair Value, Inputs, Level 1 | U.S. Plans | Receivables |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 77.1 | 77.4
Fair Value, Inputs, Level 1 | U.S. Plans | Payables |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | (139.9) | (158.6)
Fair Value, Inputs, Level 1 | International Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 28.7 | 21.4
Fair Value, Inputs, Level 1 | International Plans | Equity Securities | Common Stock |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 0.6 | 1.6
Fair Value, Inputs, Level 1 | International Plans | Real Estate | Real Estate Investments Trust |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 0.7 | 1.3
Fair Value, Inputs, Level 1 | International Plans | Cash |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 27.4 | 18.6
Fair Value, Inputs, Level 1 | International Plans | Payables |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | (0.1)
Fair Value, Inputs, Level 2 | Other Postretirement Benefit Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | 1.8
Fair Value, Inputs, Level 2 | Other Postretirement Benefit Plans | Pooled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | 1.8
Fair Value, Inputs, Level 2 | U.S. Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1,761.3 | 1,904.3
Fair Value, Inputs, Level 2 | U.S. Plans | Equity Securities | Common Stock |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 5.8 | 5.8
Fair Value, Inputs, Level 2 | U.S. Plans | Equity Securities | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 411.9 | 461.6
Fair Value, Inputs, Level 2 | U.S. Plans | Debt Securities | Other Fixed Income |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 974.7 | 1,025.3
Fair Value, Inputs, Level 2 | U.S. Plans | Other | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 105.3 | 102.1
Fair Value, Inputs, Level 2 | U.S. Plans | Other | Derivative |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 0.5 | 12.3
Fair Value, Inputs, Level 2 | U.S. Plans | Pooled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 263.1 | 297.2
Fair Value, Inputs, Level 2 | International Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 2,235.4 | 2,470.5
Fair Value, Inputs, Level 2 | International Plans | Equity Securities | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 956.1 | 1,054.8
Fair Value, Inputs, Level 2 | International Plans | Debt Securities | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 905.4 | 991.1
Fair Value, Inputs, Level 2 | International Plans | Debt Securities | Other Fixed Income |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 248.5 | 330.4
Fair Value, Inputs, Level 2 | International Plans | Other | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 118.4 | 85.8
Fair Value, Inputs, Level 2 | International Plans | Other | Derivative |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 7.0 | 7.2
Fair Value, Inputs, Level 2 | International Plans | Pooled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | 1.2
Fair Value, Inputs, Level 3 | Other Postretirement Benefit Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | 7.3
Fair Value, Inputs, Level 3 | Other Postretirement Benefit Plans | Insurance Contracts |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 7.7 | 7.3
Fair Value, Inputs, Level 3 | U.S. Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 45.2 | 64.4
Fair Value, Inputs, Level 3 | U.S. Plans | Debt Securities | Insurance Contracts |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | 17.4
Fair Value, Inputs, Level 3 | U.S. Plans | Real Estate |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 37.6 | 34.2
Fair Value, Inputs, Level 3 | U.S. Plans | Other | Private Equity |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 7.6 | 12.8
Fair Value, Inputs, Level 3 | International Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 232.7 | 227.0
Fair Value, Inputs, Level 3 | International Plans | Debt Securities | Insurance Contracts |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 120.6 | 135.5
Fair Value, Inputs, Level 3 | International Plans | Real Estate |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 41.8 | 40.8
Fair Value, Inputs, Level 3 | International Plans | Other | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | $ 70.3 | $ 50.7

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