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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Income Tax Disclosure [Line Items] |  |  |  |
Provision for income taxes | $ 16.1 | $ 20.7 | $ 67.5 | $ 60.6
Benefit from favorable tax return to provision adjustments and release of reserves for uncertain tax positions | $ 6.6 |  |  | $ 11.6
Effective tax rate excluding discrete benefits (as a percent) | 27.20% | 28.20% | 30.50% | 30.60%
Excess tax benefits related to employee stock compensation |  |  |  | $ 9.2
Accounting Standards Update No. 2016-09 |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Excess tax benefits related to employee stock compensation | $ 1.2 |  | $ 2.4 |
Adjustment to retained earnings to recognize net operating loss carryforwards attributable to excess tax benefits on stock compensation | $ 0.4 |  | $ 0.4 |

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- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11374-113907 + Details
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