Capital Stock (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020	Feb. 06, 2020
Subsequent Event [Line Items]
Shares of common stock authorized (in shares)	100,000,000.0	100,000,000.0
Shares issued and outstanding (in shares)	49,700,000	49,500,000
Maximum shares allowed for issuance (in shares)	2,000,000.0
Par value (in dollars per share)	$ 10
250 Million Share Repurchase Program
Subsequent Event [Line Items]
Stock repurchase program amount			$ 250,000,000
Stock repurchase program remaining amount	$ 200,000,000