Stock Repurchase Program - Summary of Stock Repurchase Activity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Equity [Abstract]
Total number of shares repurchased		348,974		393,975	421,716
Average price paid per share (in dollars per share)		$ 32.33		$ 38.78	$ 32.33
Total value of shares repurchased	$ 15.3	$ 11.3	$ 2.3	$ 15.3	$ 13.6

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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