Income Taxes Additional Information (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2017 |
Jun. 30, 2016 |
Jun. 30, 2017 |
Jun. 30, 2016 |
|
| Income Tax Disclosure [Abstract] | ||||
| Income tax provision | $ 65.4 | $ 61.8 | $ 127.1 | $ 117.3 |
| Effective income tax rate, percent | 31.40% | 34.80% | 32.80% | 34.80% |
| Effective income tax rate, at federal statutory income tax rate, percent | 35.00% | |||
| Cash paid for taxes, net of refunds received | $ 105.7 | $ 83.3 | ||