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Changes in Accounting Policies - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Asset associated with future estimated variable consideration	$ 9.2	$ 9.2
Increase (decrease) in retained earnings	$ 1,162.1		$ 922.7
Accounting Standards Update, 2014-09, Future Estimated Variable Consideration
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Asset associated with future estimated variable consideration		9.2
Increase (decrease) in retained earnings		6.5
Accounting Standards Update, 2014-09, Determination And Capitalization Of Direct Costs Incurred
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) in retained earnings		(5.1)
Reduction in prepaid commissions		$ 7.2

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