Capital Stock (Details) - USD ($)		1 Months Ended	12 Months Ended
	Aug. 26, 2020	Sep. 30, 2020	Dec. 31, 2019	Oct. 19, 2020	Feb. 06, 2020	May 08, 2017
Subsequent Event [Line Items]
Shares of common stock authorized (in shares)		100,000,000	100,000,000.0
Shares issued and outstanding (in shares)		49,400,000	50,100,000
Maximum shares allowed for issuance (in shares)		2,000,000.0
Par value (in dollars per share)		$ 10
ASR August 2020
Subsequent Event [Line Items]
Stock repurchased and retired during period (in shares)	849,978
Accelerated share repurchased payment	$ 50,000,000
ASR, initial price per share (in dollars per share)	$ 58.83
ASR September 2020
Subsequent Event [Line Items]
Stock repurchased and retired during period (in shares)		246,676
ASR, final price per share (in dollars per share)		$ 45.59
250 Million Share Repurchase Program
Subsequent Event [Line Items]
Stock repurchase program amount					$ 250,000,000
Stock repurchase program remaining amount		$ 200,000,000
200 Million Share Repurchase Program
Subsequent Event [Line Items]
Stock repurchase program amount						$ 200,000,000
Stock repurchased and retired during period (in shares)			1,300,000
Stock repurchase program amount used			$ 94,000,000
Average price per share (in dollars per share)			$ 69.35
Stock repurchase program remaining amount			$ 106,000,000
Subsequent Event
Subsequent Event [Line Items]
Dividends declared (in dollars per share)				$ 0.15