Stock-Based Compensation Stock-Based Compensation Expense (Detail) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Mar. 31, 2017 |
Apr. 01, 2016 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Pretax compensation expense | $ 12.0 | $ 11.5 | $ 45.3 | $ 35.2 | $ 30.8 |
| Income tax benefit | (4.1) | (3.8) | (15.1) | (11.8) | (9.9) |
| Total stock-based compensation expense | 7.9 | 7.7 | 30.2 | 23.4 | 20.9 |
| Stock Awards | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Pretax compensation expense | 7.4 | 7.1 | 28.1 | 22.5 | 19.3 |
| Income tax benefit | (2.5) | (2.3) | (9.3) | (7.5) | (6.1) |
| Total stock-based compensation expense | 4.9 | 4.8 | 18.8 | 15.0 | 13.2 |
| Stock Options | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Pretax compensation expense | 4.6 | 4.4 | 17.2 | 12.7 | 11.5 |
| Income tax benefit | (1.6) | (1.5) | (5.8) | (4.3) | (3.8) |
| Total stock-based compensation expense | $ 3.0 | $ 2.9 | $ 11.4 | $ 8.4 | $ 7.7 |