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Earnings Per Share and Equity - Schedule of Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Number of repurchased shares (in shares)	3,600,000	7,800,000	16,800,000
Aggregate purchase price	$ 65.3	$ 138.9	$ 315.0
Fees, commissions and other expenses	0.1	0.1	0.3
Total cash used for share repurchases	$ 65.4	$ 139.0	$ 315.3
Weighted-average purchase price per share (in dollars per share)	$ 18.08	$ 17.89	$ 18.78
Available under the 2018 Share Repurchase Program	$ 1,295.8	$ 1,361.1	$ 1,500.0
Treasury shares reissued or retired (in shares)	0

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- Definition

Treasury Stock, Fees Commissions and Other Expenses

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Treasury Stock, Shares, Reissued or Retired During Period

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Treasury Stock, Value, Acquired, Cost Method, Net of Fees

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- Definition

Amount remaining of a stock repurchase plan authorized.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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