Debt (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Debt Instrument [Line Items]
Total debt	$ 4,966.5		$ 5,058.9
Less: current portion	(536.9)		(594.9)
Total long-term debt	4,429.6		4,464.0
Senior Secured Credit Facility Term Loans
Debt Instrument [Line Items]
Total debt	2,013.1		2,024.6
6 1/8% Senior Notes Due 2022
Debt Instrument [Line Items]
Total debt	300.0	[1]	300.0	[1]
Interest rate of debt instrument	6.125%		6.125%
Debt instrument maturity year	2022		2022
3 3/4% Senior Notes Due 2021
Debt Instrument [Line Items]
Total debt	321.5	[1]	357.9	[1]
Interest rate of debt instrument	3.75%		3.75%
Debt instrument maturity year	2021		2021
7 1/2% Senior Subordinated Notes Due 2017
Debt Instrument [Line Items]
Total debt	654.3	[2]	650.6	[2]
Interest rate of debt instrument	7.50%		7.50%
Debt instrument maturity year	2017		2017
1 7/8% Senior Subordinated Convertible Notes Due 2018
Debt Instrument [Line Items]
Total debt	449.1	[3]	445.8	[3]
Interest rate of debt instrument	1.875%		1.875%
Debt instrument maturity year	2018		2018
1 1/2% Senior Subordinated Convertible Notes Due 2019
Debt Instrument [Line Items]
Total debt	227.9	[3]	226.0	[3]
Interest rate of debt instrument	1.50%		1.50%
Debt instrument maturity year	2019		2019
1 1/8% Senior Subordinated Convertible Notes due 2034
Debt Instrument [Line Items]
Total debt	488.5	[3]	484.1	[3]
Interest rate of debt instrument	1.125%		1.125%
Debt instrument maturity year	2034		2034
Securitization Facility
Debt Instrument [Line Items]
Total debt	436.7		479.3
Non-U.S. Borrowings
Debt Instrument [Line Items]
Total debt	66.7		83.2
Other
Debt Instrument [Line Items]
Total debt	$ 8.7		$ 7.4

[1] Collectively, the "Senior Notes."

[2] The "Senior Subordinated Notes."

[3] Collectively, the "Senior Subordinated Convertible Notes."