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Defined Benefit Plans - Obligations and Funded Status (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Mar. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Change in the Projected Benefit Obligation (PBO):            
Actuarial loss (gain)   $ 2.5   $ 1.9 $ 8.6 $ 13.7
Change in Plan Assets:            
Fair value of plan assets at beginning of year $ 561.9     561.9    
Fair value of plan assets at end of year       577.7 561.9  
Pension Benefits [Member]            
Change in the Projected Benefit Obligation (PBO):            
Projected benefit obligation at beginning of year 767.7     767.7 808.6  
Service cost       9.6 11.5  
Interest cost       34.4 33.7  
Plan amendments       0.1    
Actuarial loss (gain)       11.7 (54.1)  
Benefits paid       (31.8) (31.4)  
Plan curtailment gain         (0.6)  
Projected benefit obligation at end of year       791.7 767.7 808.6
Accumulated benefit obligation at end of year (excludes the impact of future compensation increases)       791.7 759.8  
Change in Plan Assets:            
Fair value of plan assets at beginning of year 561.9     561.9 608.2  
Actual return on plan assets       46.6 (18.2)  
Employer contributions       1.0 3.3  
Benefits paid       (31.8) (31.4)  
Fair value of plan assets at end of year       577.7 561.9 608.2
Funded status (Fair value of plan assets less PBO)       (214.0) (205.8)  
Postretirement Benefits [Member]            
Change in the Projected Benefit Obligation (PBO):            
Projected benefit obligation at beginning of year 15.6     15.6 20.1  
Service cost         0.1  
Interest cost       0.3 0.6  
Plan amendments 10.7   $ 15.3 (12.3) 0.1  
Actuarial loss (gain) $ 0.9   0.6 1.6 (1.3)  
Benefits paid       (1.6) (2.6)  
Medicare Part D reimbursement         0.3  
Plan curtailment gain     $ 3.5      
Plan settlement gain         (1.6)  
Foreign exchange         (0.1)  
Projected benefit obligation at end of year       3.6 15.6 $ 20.1
Change in Plan Assets:            
Employer contributions       1.5 2.3  
Medicare Part D reimbursement         0.3  
Benefits paid       (1.5) (2.6)  
Funded status (Fair value of plan assets less PBO)       $ (3.6) $ (15.6)