Consolidated Statement Of Shareholders' Equity (Deficit) - 9 months ended Sep. 30, 2015 - USD ($) shares in Millions, $ in Millions	Total	Preferred Stock [Member]	Common Stock [Member]	Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Preferred shares, issued, beginning balance at Dec. 31, 2014	0.0	0.0
Common shares, shares issued, beginning balance at Dec. 31, 2014	172.2		172.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			0.1
Stock Issued During Period, Shares, New Issues			0.3
Stock Issued During Period, Shares, Employee Stock Purchase Plans			0.2
Stock Issued During Period, Shares, Acquisitions			1.6
Stock Repurchased During Period, Shares			(5.2)
Preferred shares, issued, ending balance at Sep. 30, 2015	0.0	0.0
Common shares, shares issued, ending balance at Sep. 30, 2015	169.2		169.2
Balance at Dec. 31, 2014	$ 936.5	$ 0.0	$ 1.7	$ 2,711.9	$ (1,760.5)	$ (16.6)
Shareholders' Equity (Deficit) [Roll Forward]
Equity-based compensation expense	18.4	0.0	0.0	18.4	0.0	0.0
Stock Option Exercises	1.7	0.0	0.0	1.7	0.0	0.0
Stock Issued During Period, Value, New Issues	0.0	0.0	0.0	0.0	0.0	0.0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	0.4	0.0	0.0	0.4	0.0	0.0
Stock Issued During Period, Value, Employee Stock Purchase Plan	6.5	0.0	0.0	6.5	0.0	0.0
Stock Issued During Period, Value, Acquisitions	55.0	0.0	0.0	55.0	0.0	0.0
Dividends Declared	(34.6)	0.0	0.0	0.0	(34.6)	0.0
Net income (loss)	313.8	0.0	0.0	0.0	313.8	0.0
Stock Repurchased and Retired During Period, Value	(193.3)	0.0	0.0	0.0	(193.3)	0.0
Foreign currency translation adjustment	(28.7)	0.0	0.0	0.0	0.0	(28.7)
Balance at Sep. 30, 2015	$ 1,075.7	$ 0.0	$ 1.7	$ 2,793.9	$ (1,674.6)	$ (45.3)