Fair Value Measurements - Estimated Fair Value of Company's Debt (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt instruments carrying value	$ 1,830.7	$ 1,827.5
Significant Other Observable Inputs (Level 2)
Debt Instrument [Line Items]
Estimated fair value debt	1,823.5	1,852.8
Significant Other Observable Inputs (Level 2) | Revolver
Debt Instrument [Line Items]
Estimated fair value debt	44.0	30.0
Significant Other Observable Inputs (Level 2) | Senior Notes
Debt Instrument [Line Items]
Estimated fair value debt	431.4	443.4
Significant Other Observable Inputs (Level 2) | Term Loan B
Debt Instrument [Line Items]
Estimated fair value debt	$ 1,348.1	$ 1,379.4