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Non-vested Award Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock-based Payment Award
Additional performance cash awards settled in shares	$ 28.0	$ 16.6
Stock-settled awards
Stock-based Payment Award
Non-vested as of January 1, 2016	2.0
Nonvested as of January 1, 2016, Weighted-average grant date fair value	$ 18.53
Granted	1.1
Granted, Weighted-average grant-date fair value	$ 21.87	$ 22.07	$ 17.77
Vested	(0.8)
Vested, Weighted-average grant date fair value	$ 16.64
Forfeited	0.0
Forfeited, Weighted-average grant date fair value	$ 19.80
Non-vested as of December 31, 2016	2.3	2.0
Nonvested as of December 31, 2016, Weighted-average grant date fair value	$ 20.84	$ 18.53
Total unrecognized compensation expense remaining	$ 23.7
Weighted-average years expected to be recognized over	1 year 2 months
Cash-settled awards
Stock-based Payment Award
Non-vested as of January 1, 2016	0.1
Nonvested as of January 1, 2016, Weighted-average grant date fair value	$ 18.75
Granted	0.0
Granted, Weighted-average grant-date fair value	$ 22.54	$ 20.46	$ 18.20
Vested	0.0
Vested, Weighted-average grant date fair value	$ 17.04
Forfeited	0.0
Forfeited, Weighted-average grant date fair value	$ 19.83
Non-vested as of December 31, 2016	0.1	0.1
Nonvested as of December 31, 2016, Weighted-average grant date fair value	$ 20.49	$ 18.75
Total unrecognized compensation expense remaining	$ 1.7
Weighted-average years expected to be recognized over	1 year 3 months
Cash awards granted during the period target value	$ 5.2	$ 1.3	$ 5.8
Incentive Compensation Expense, Non Share-based	$ 3.1	$ 3.0	$ 3.1
Performance-based awards
Stock-based Payment Award
Non-vested as of January 1, 2016	7.1
Nonvested as of January 1, 2016, Weighted-average grant date fair value	$ 17.50
Granted	3.3
Granted, Weighted-average grant-date fair value	$ 19.58	$ 20.88	$ 16.56
Vested	(1.3)
Vested, Weighted-average grant date fair value	$ 11.92
Forfeited	(0.6)
Forfeited, Weighted-average grant date fair value	$ 17.46
Non-vested as of December 31, 2016	8.5	7.1
Nonvested as of December 31, 2016, Weighted-average grant date fair value	$ 19.16	$ 17.50
Total unrecognized compensation expense remaining	$ 90.0
Weighted-average years expected to be recognized over	1 year 8 months
Cash awards granted during the period target value	$ 37.4	$ 31.8	$ 33.0
Incentive Compensation Expense, Non Share-based	$ 39.8	$ 35.8	$ 27.3

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Target value of all cash awards granted during the period (settled in shares or cash)

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Unrecognized cost of unvested share-based compensation awards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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