CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Millions, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Common Stock in Treasury	Noncontrolling Interest
Total stockholders' equity, Beginning of Period at Dec. 31, 2011	$ 2,188.4	$ 1.2	$ 1,271.8	$ 1,361.9	$ (125.5)	$ (599.1)	$ 278.1
Shares oustanding, Beginning of Period (in shares) at Dec. 31, 2011		108.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	103.6	0	0	105.8	0	0	(2.2)
Other Comprehensive Income (Loss), Net of Tax	1.9	0	0	0	1.4	0	0.5
Issuance of Common Stock	13.5	0	13.5	0	0	0	0
Issuance of Common Stock (in shares)		1.0
Compensation under Stock-based Plans - net	12.4	0	7.3	0	0	5.1	0
Compensation under Stock-based Plans - net (in shares)		0.2
Redeemable noncontrolling interest	(260.0)	0	(12.5)	0	0	0	(247.5)
Acquisition	2.1	0	0	0	0	0	2.1
Divestiture	(7.4)	0	0	0	0	0	(7.4)
Purchase of noncontrolling interest	0	0	(0.3)	0	0	0	0.3
Distributions to noncontrolling interest	(0.3)	0	0	0	0	0	(0.3)
Redemption of convertible debt	(19.1)	0	19.1	0	0	0	0
Acquisition of Treasury Stock	(3.8)	0	0	0	0	(3.8)	0
Acquisition of Treasury Stock (in shares)		(0.1)
Total stockholders' equity, End of Period at Dec. 31, 2012	2,031.3	1.2	1,260.7	1,467.7	(124.1)	(597.8)	23.6
Shares outstanding, End of Period (in shares) at Dec. 31, 2012		109.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	220.9	0	0	226.0	0	0	(5.1)
Other Comprehensive Income (Loss), Net of Tax	8.0	0	0	0	7.6	0	0.4
Issuance of Common Stock	17.9	0	17.9	0	0	0	0
Issuance of Common Stock (in shares)		0.8
Compensation under Stock-based Plans - net	23.4	0	22.1	0	0	1.3	0
Compensation under Stock-based Plans - net (in shares)		0.1
Acquisition	7.8	0	0	0	0	0	7.8
Dividends, Common Stock, Cash	(5.5)	0	0.1	(5.6)	0	0	0
Divestiture	(2.0)	0	0	0	0	0	(2.0)
Purchase of noncontrolling interest	(54.0)	0	(54.0)	0	0	0	0
Redemption of convertible debt	0.7	0	0.7	0	0	0	0
Acquisition of Treasury Stock	(33.7)	0	0	0	0	(33.7)	0
Acquisition of Treasury Stock (in shares)		(0.9)
Total stockholders' equity, End of Period at Dec. 31, 2013	2,214.8	1.2	1,247.5	1,688.1	(116.5)	(630.2)	24.7
Shares outstanding, End of Period (in shares) at Dec. 31, 2013		109.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	319.5	0	0	319.0	0	0	0.5
Other Comprehensive Income (Loss), Net of Tax	(313.4)	0	0	0	(313.3)	0	(0.1)
Issuance of Common Stock	21.7	0	21.7	0	0	0	0
Issuance of Common Stock (in shares)		0.9
Compensation under Stock-based Plans - net	10.0	0	8.8	0	0	1.2	0
Compensation under Stock-based Plans - net (in shares)		0
Acquisition	8.1	0	0	0	0	0	8.1
Dividends, Common Stock, Cash	(21.8)	0	0.4	(22.2)	0	0	0
Purchase of noncontrolling interest	(26.9)	0	(26.9)	0	0	0	0
Acquisition of Treasury Stock	(172.9)	0	0	0	0	(172.9)	0
Acquisition of Treasury Stock (in shares)		(5.4)
Total stockholders' equity, End of Period at Dec. 31, 2014	$ 2,039.1	$ 1.2	$ 1,251.5	$ 1,984.9	$ (429.8)	$ (801.9)	$ 33.2
Shares outstanding, End of Period (in shares) at Dec. 31, 2014		105.4