Stockholders' Equity - Stock Repurchase Program (Details) - USD ($) shares in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2020	Feb. 28, 2020
Stockholders' Equity Note [Abstract]
Stock repurchase program, authorized amount			$ 600,000,000
Stock repurchased and retired during period (in shares)	3.7	7.4
Stock repurchased and retired during period, aggregate purchase price	$ 75,800,000	$ 139,800,000

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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