Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of debt not otherwise defined (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

+ Details

Name:	us-gaap_OtherLongTermDebtNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
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Period Type:

Long-Term Debt - Schedule of Long-Term Debt Instruments (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended			3 Months Ended
	Mar. 30, 2015	Feb. 03, 2015	Jan. 31, 2014	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt				$ 2,301.7us-gaap_LongTermDebtNoncurrent	$ 2,198.3us-gaap_LongTermDebtNoncurrent
Other long-term debt				0.3us-gaap_OtherLongTermDebtNoncurrent	0.7us-gaap_OtherLongTermDebtNoncurrent
Weighted average cost of debt				4.70%us-gaap_DebtWeightedAverageInterestRate	4.60%us-gaap_DebtWeightedAverageInterestRate
Secured Debt \| Term loan, due 2021
Debt Instrument [Line Items]
Maturity date				Jan. 31, 2021
Long-term debt				798.3	798.3
Senior Unsecured Notes
Debt Instrument [Line Items]
Long-term debt				1,503.1	1,399.3
Senior Unsecured Notes \| 5.250% senior unsecured notes, due 2022
Debt Instrument [Line Items]
Maturity date		Jan. 31, 2022		Jan. 31, 2022
Long-term debt				549.3	549.3
Senior Unsecured Notes \| 5.625% senior unsecured notes, due 2024
Debt Instrument [Line Items]
Maturity date	Feb. 15, 2024	Jan. 31, 2024	Feb. 15, 2024	Jan. 31, 2024
Long-term debt				503.8	400.0
Senior Unsecured Notes \| 5.875% senior unsecured notes, due 2025
Debt Instrument [Line Items]
Maturity date		Mar. 15, 2025		Mar. 15, 2025
Long-term debt				$ 450.0	$ 450.0