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Shareholders' Equity and Long-Term Incentive Compensation - Common Stock and Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary of common shares issued, treasury shares and shares outstanding
Balance at the beginning of the period (in shares)	42,650,599	41,940,000	41,416,000
Restricted stock shares and restricted stock units (in shares)	457,000	280,000	337,000
Retirement of treasury stock (in shares)			0
Other (in shares)	343,000	431,000	187,000
Balance at the end of the period (in shares)	43,450,305	42,650,599	41,940,000
Amount of retirement of treasury stock			$ 0.0
Common Stock
Class of Stock [Line Items]
Authorized shares (in shares)	200,000,000.0
Par value (in dollars per share)	$ 0.01
Summary of common shares issued, treasury shares and shares outstanding
Balance at the beginning of the period (in shares)	51,186,000	50,755,000	100,526,000
Restricted stock shares and restricted stock units (in shares)	0	0	42,000
Retirement of treasury stock (in shares)			(50,000,000)
Other (in shares)	343,000	431,000	187,000
Balance at the end of the period (in shares)	51,529,000	51,186,000	50,755,000
Amount of retirement of treasury stock			$ 0.5
Common Stock In Treasury
Summary of common shares issued, treasury shares and shares outstanding
Balance at the beginning of the period (in shares)	(8,535,000)	(8,815,000)	(59,110,000)
Restricted stock shares and restricted stock units (in shares)	457,000	280,000	295,000
Retirement of treasury stock (in shares)			50,000,000
Other (in shares)	0	0	0
Balance at the end of the period (in shares)	(8,078,000)	(8,535,000)	(8,815,000)
Amount of retirement of treasury stock			$ (2,948.1)
Paid-In Capital
Summary of common shares issued, treasury shares and shares outstanding
Amount of retirement of treasury stock			1,285.4
Retained Earnings (Deficit)
Summary of common shares issued, treasury shares and shares outstanding
Amount of retirement of treasury stock			$ 1,662.2

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