Statement of Shareholders' Equity (USD $) In Millions	Total	Preferred stock [Member]	Common stock [Member]	Additional paid-in capital [Member]	Retained earnings (deficit) [Member]	Accumulated other comprehensive loss [Member]	Treasury stock [Member]	Non-controlling interest [Member]
Balance at December 31, 2011 at Dec. 31, 2011	$ 993.0	$ 667.3	$ 3.6	$ 78.6	$ (19.4)	$ (23.3)	$ (49.6)	$ 335.8
Net income	212.9				156.2			56.7
Other comprehensive income (loss), net	(1.2)					9.9		(11.1)
Cash dividends	(61.9)				(48.0)			(13.9)
Issuance of common stock and other, net	0.3			0.3
Balance at September 30, 2012 at Sep. 30, 2012	$ 1,143.1	$ 667.3	$ 3.6	$ 78.9	$ 88.8	$ (13.4)	$ (49.6)	$ 367.5