Financial Information for Subsidiary and Guarantor Parent Financial Information for Subsidiary and Guarantor Parent (Changes) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Current assets	$ 2,465.6us-gaap_AssetsCurrent		$ 2,482.1us-gaap_AssetsCurrent
Assets	6,556.8us-gaap_Assets		6,582.6us-gaap_Assets
Current liabilities	937.0us-gaap_LiabilitiesCurrent		959.9us-gaap_LiabilitiesCurrent
Liabilities	3,836.7us-gaap_Liabilities		3,861.2us-gaap_Liabilities
Stockholders' equity	2,708.0	2,967.1	2,709.3	2,994.7
Cash flows provided by (used in) operating activities	12.0	(56.9)
Net Cash Provided by (Used in) Investing Activities	(22.5)	(108.9)
Cash used in financing activities	(21.0)	(23.3)
NonGuarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Current assets	4,185.0		4,183.1
Assets	6,751.0		6,758.0
Current liabilities	433.8		471.1
Liabilities	817.7		855.9
Stockholders' equity	5,921.2		5,890.0
Cash flows provided by (used in) operating activities	80.6	98.4
Net Cash Provided by (Used in) Investing Activities	(110.4)	(292.9)
Cash used in financing activities	(0.2)	0
Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Current assets	642.9		623.8
Assets	2,379.8		2,361.2
Current liabilities	1,586.2		1,532.3
Liabilities	2,114.1		2,064.1
Stockholders' equity	265.7		297.1
Cash flows provided by (used in) operating activities	(42.3)	(125.6)
Net Cash Provided by (Used in) Investing Activities	(9.0)	(24.9)
Cash used in financing activities	49.5	150.0
Parent Company
Condensed Financial Statements, Captions [Line Items]
Current assets	5.6		66.0
Assets	6,180.8		6,241.3
Current liabilities	1,284.9		1,347.3
Liabilities	3,472.8		3,532.0
Stockholders' equity	2,708.0		2,709.3
Cash flows provided by (used in) operating activities	(26.3)	(29.7)
Net Cash Provided by (Used in) Investing Activities	0	0
Cash used in financing activities	26.6	35.6
Consolidation Eliminations
Condensed Financial Statements, Captions [Line Items]
Current assets	(2,367.9)		(2,390.8)
Assets	(8,754.8)		(8,777.9)
Current liabilities	(2,367.9)		(2,390.8)
Liabilities	(2,567.9)		(2,590.8)
Stockholders' equity	(6,186.9)		(6,187.1)
Cash flows provided by (used in) operating activities	0	0
Net Cash Provided by (Used in) Investing Activities	96.9	208.9
Cash used in financing activities	$ (96.9)	$ (208.9)

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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