Long-Term Debt -Debt Balances and Interest Rates (Details) £ in Millions, $ in Millions	Sep. 30, 2015 USD ($)	Aug. 01, 2015 USD ($)	Aug. 01, 2015 GBP (£)	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Debt, short-term and long-term	$ 3,268.3			$ 3,177.0
Deferred Finance Costs, Net	(28.0)			(26.4)
Deferred financing costs, net	(28.0)			(26.4)
Debt, Long-term and Short-term, Combined Amount				3,192.4
Current maturities of long-term debt	(27.5)			(15.4)
Deferred Finance Costs, Current, Net	0.0			0.0
Long-Term Debt, Current Maturities, Net of Deferred Financing Costs, Discount, or Premium	(27.5)			(15.4)
Long-term Debt, Excluding Current Maturities	3,240.3			3,150.6
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	3,267.8			3,166.0
Revolving Loan [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	0.0			0.0
Deferred Finance Costs, Net	$ 0.0			$ 0.0
Long-term Debt, Weighted Average Interest Rate	0.00%			0.00%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 0.0			$ 0.0
Kelway Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	0.0
Deferred Finance Costs, Net	$ 0.0
Long-term Debt, Weighted Average Interest Rate	0.00%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 0.0
Term Loan [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	1,502.0			1,513.5
Deferred Finance Costs and Discount, Net	$ (7.1)			$ (8.3)
Long-term Debt, Weighted Average Interest Rate	3.25%			3.25%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 1,494.9			$ 1,505.2
Kelway Term Loan [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	93.8	$ 100.0	£ 64.0
Deferred Finance Costs, Net	(0.7)
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	93.1
Senior notes due 2019 [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	0.0			503.9
Deferred Finance Costs, Net				(4.4)
Deferred Finance Costs, Net and Unamortized Premium				$ (3.1)
Long-term Debt, Weighted Average Interest Rate				8.50%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium				$ 500.8
Premium, unamortized				1.3
Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	525.0
Deferred Finance Costs, Net	(6.4)
Deferred financing costs, net	$ (6.8)
Long-term Debt, Weighted Average Interest Rate	5.00%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 518.6
Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	600.0			600.0
Deferred Finance Costs, Net	$ (6.9)			$ (7.6)
Long-term Debt, Weighted Average Interest Rate	6.00%			6.00%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 593.1			$ 592.4
Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	575.0			575.0
Deferred Finance Costs, Net	$ (6.9)			$ (7.4)
Long-term Debt, Weighted Average Interest Rate	5.50%			5.50%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 568.1			$ 567.6
LIBOR [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	3.25%
LIBOR [Member] | Kelway Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	1.98%
Accounts Payable, Inventory Financing [Member]
Debt Instrument [Line Items]
Revolving Loan financing agreement	$ 353.2			330.1
Reported Value Measurement [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term				$ 3,192.4
Debt, Long-term and Short-term, Combined Amount	$ 3,295.8