Stock-Based Compensation Narrative (Details) shares in Thousands, $ in Millions |
3 Months Ended | 6 Months Ended | |
|---|---|---|---|
|
Jun. 30, 2017
USD ($)
shares
|
Jun. 30, 2017
USD ($)
shares
|
Jul. 01, 2016
plan
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Number of stock-based compensation plans | plan | 0 | ||
| Shares of common stock reserved for issuance under the Stock Plan | shares | 7,000 | 7,000 | |
| Income tax benefit, stock awards | $ 6.9 | $ 16.5 | |
| Remaining service period related to the awards | 2 years | ||
| Shares withheld to satisfy tax requirement | shares | 133 | ||
| Aggregate value of shares withheld to satisfy tax requirement | $ 7.7 | ||
| Aggregate intrinsic value of options exercised | 25.0 | ||
| Cash receipts for options exercised | 15.0 | ||
| Accounting Standards Update 2016-09 [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 5.2 | $ 10.1 | |