Restricted Cash (Details) € in Millions, £ in Millions, $ in Millions	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 USD ($)	Feb. 28, 2015 GBP (£)	Feb. 19, 2015 GBP (£)	Dec. 31, 2014 USD ($)
Restricted cash
Total long-term debt			$ 5,107.8			$ 3,048.8
Debt Instrument, Face Amount			5,100.0			3,000.0
Restricted cash non current						$ 0.0
British Pound Denominated Acquisition Escrow Account | Rexam PLC
Restricted cash
Invested in escrow account		£ 792	1,167.0
U.S. Escrow Account | Rexam PLC
Restricted cash
Invested in escrow account			987.5
3.50% Senior Notes, euro denominated, due December 2020
Restricted cash
Total long-term debt	€ 400		$ 434.5
Interest rate (as a percent)	3.50%	3.50%	3.50%			3.50%
3.50% Senior Notes, euro denominated, due December 2020 | Rexam PLC
Restricted cash
Total long-term debt | €	€ 400
Interest rate (as a percent)	3.50%	3.50%	3.50%
4.375% Senior Notes, euro denominated, due December 2023
Restricted cash
Total long-term debt	€ 700		$ 760.3
Interest rate (as a percent)	4.375%	4.375%	4.375%
4.375% Senior Notes, euro denominated, due December 2023 | Rexam PLC
Restricted cash
Total long-term debt | €	€ 700
Interest rate (as a percent)	4.375%	4.375%	4.375%
Bridge Facility
Restricted cash
Debt Instrument, Face Amount | £		£ 1,900		£ 3,300	£ 3,300