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Stockholders' Equity and Earnings Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 03, 2020
Anti-dilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock repurchase program, amount authorized			$ 500.0
Repurchased by company (in shares)	4,471,682
Average price (in dollars per share)	$ 32.64
Total cost	$ 146.0
RSUs
Anti-dilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average anti-dilutive shares (in shares)	328,000	263,000