Stock-Based Compensation Stock-Based Compensation Expense (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2017 |
Jul. 01, 2016 |
Jun. 30, 2017 |
Jul. 01, 2016 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Pretax compensation expense | $ 13.3 | $ 10.9 | $ 25.3 | $ 22.4 |
| Income tax benefit | (4.9) | (3.8) | (9.0) | (7.6) |
| Total stock-based compensation expense | 8.4 | 7.1 | 16.3 | 14.8 |
| Stock Awards | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Pretax compensation expense | 8.0 | 7.1 | 15.4 | 14.2 |
| Income tax benefit | (3.1) | (2.5) | (5.6) | (4.8) |
| Total stock-based compensation expense | 4.9 | 4.6 | 9.8 | 9.4 |
| Stock Options | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Pretax compensation expense | 5.3 | 3.8 | 9.9 | 8.2 |
| Income tax benefit | (1.8) | (1.3) | (3.4) | (2.8) |
| Total stock-based compensation expense | $ 3.5 | $ 2.5 | $ 6.5 | $ 5.4 |