Nature of Business and Summary of Significant Accounting Policies - Adoption of New Accounting Standards (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in net deferred tax liabilities, noncurrent	$ 266.7	$ 132.2
Reclassification of deferred debt issuance costs	$ 13.7	16.6
New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification out of deferred income tax assets		0.1
Reclassification out of deferred income tax liabilities		177.1
Increase in net deferred tax assets, noncurrent		0.1
Increase in net deferred tax liabilities, noncurrent		177.1
New Accounting Pronouncement, Early Adoption, Effect | Other Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of deferred debt issuance costs		(16.6)
New Accounting Pronouncement, Early Adoption, Effect | Long-term Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of deferred debt issuance costs		$ 16.6