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Schedule of Changes in Benefit Obligations, Plan Assets and Funded Status of Defined Benefit Pension and Post-Retirement Benefit Plans (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Change in fair value of plan assets |  |  |  |
Plan assets at beginning of year |  | $ 785.6 |  |
Plan assets at end of year |  | 873.8 | $ 785.6 |
Pension Plans, Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation (ABO) at December 31 |  | 921.8 | 894.3 |
Change in projected benefit obligations (PBO) |  |  |  |
PBO at beginning of year |  | (895.8) | (892.9) |
Service cost |  | (1.8) | (1.8) | $ (1.9)
Interest cost |  | (30.0) | (30.6) | (37.6)
Plan amendments |  |  | (0.7) |
Actuarial loss including assumption changes |  | (54.3) | (31.0) |
Benefits paid |  | 59.2 | 61.2 |
PBO at end of year |  | (922.7) | (895.8) | (892.9)
Change in fair value of plan assets |  |  |  |
Plan assets at beginning of year |  | 787.0 | 759.0 |
Actual return on plan assets |  | 116.5 | 57.0 |
Contribution by the company |  | 30.5 | 32.2 |
Benefits paid |  | (59.2) | (61.2) |
Plan assets at end of year |  | 874.8 | 787.0 | 759.0
Funded status |  | (47.9) | (108.8) |
Current liabilities |  | (0.5) | (0.5) |
Non-current liabilities |  | (47.4) | (108.3) |
Net pension liability at end of year | [1] | (47.9) | (108.8) |
Net actuarial loss (gain) |  | 451.8 | 473.5 |
Prior service cost |  | (0.5) | (0.9) |
Total recognized in accumulated other comprehensive loss |  | 451.3 | 472.6 |
Post-Retirement Benefits |  |  |  |
Change in projected benefit obligations (PBO) |  |  |  |
PBO at beginning of year |  | (6.6) | (6.6) |
Service cost |  | (0.1) | (0.1) | (0.1)
Interest cost |  | (0.3) | (0.2) | (0.3)
Participant contributions |  | (0.1) |  |
Actuarial loss including assumption changes |  | (1.1) | (0.2) |
Benefits paid |  | 0.6 | 0.5 |
PBO at end of year |  | (7.6) | (6.6) | $ (6.6)
Change in fair value of plan assets |  |  |  |
Contribution by the company |  | 0.4 | 0.5 |
Participant contributions |  | 0.1 |  |
Benefits paid |  | (0.5) | (0.5) |
Funded status |  | (7.6) | (6.6) |
Current liabilities |  | (0.3) | (0.4) |
Non-current liabilities |  | (7.3) | (6.2) |
Net pension liability at end of year |  | (7.6) | (6.6) |
Net actuarial loss (gain) |  | (0.8) | (2.0) |
Prior service cost |  | (2.6) | (2.9) |
Total recognized in accumulated other comprehensive loss |  | $ (3.4) | $ (4.9) |
[1] | In addition, the Company has a liability for a foreign pension plan of $0.2 million and $0.2 million at December 31, 2017 and 2016, respectively.

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