Employee Benefit Plan Obligations Plan Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Feb. 24, 2017	Feb. 26, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount			$ 0.0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount			$ 0.0
Defined Benefit Plan, Actual Plan Asset Allocations		100.00%	100.00%
Defined Benefit Plan, Target Plan Asset Allocations		100.00%	100.00%
Defined Benefit Plan, Fair Value of Plan Assets		$ 46.7	$ 47.3
Equity Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations		50.00%	57.00%
Defined Benefit Plan, Target Plan Asset Allocations		54.00%	55.00%
Debt Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations		29.00%	34.00%
Defined Benefit Plan, Target Plan Asset Allocations		27.00%	39.00%
Real Estate [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations		2.00%	2.00%
Defined Benefit Plan, Target Plan Asset Allocations		0.00%	0.00%
Defined Benefit Plan, Fair Value of Plan Assets		$ 0.8	$ 0.9
All Other Plan Assets [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	[1]	19.00%	7.00%
Defined Benefit Plan, Target Plan Asset Allocations	[1]	19.00%	6.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		$ 6.3	$ 0.5
Equity Securities, U.S. Large Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			0.8
Equity Securities, U.S. Small Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			0.8
Equity Securities, U.S. Index [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			0.8
Equity Securities, International [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		23.4	23.8
Fixed Income Funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		13.6	16.7
Group Annuity Contract [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		1.9	2.0	[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		2.0	2.1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)		0.1	0.1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issues, Settlements		(0.2)	(0.2)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		1.9	2.0
Guaranteed Insurance Contracts [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.7	1.0	[3]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		1.0	1.3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)		0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issues, Settlements		(0.3)	(0.3)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		0.7	1.0
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		7.1	3.8
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.8	0.9
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		6.3	0.5
Fair Value, Inputs, Level 1 [Member] | Equity Securities, U.S. Large Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			0.8
Fair Value, Inputs, Level 1 [Member] | Equity Securities, U.S. Small Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			0.8
Fair Value, Inputs, Level 1 [Member] | Equity Securities, U.S. Index [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			0.8
Fair Value, Inputs, Level 1 [Member] | Equity Securities, International [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0	0.0
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0	0.0
Fair Value, Inputs, Level 1 [Member] | Group Annuity Contract [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0	0.0	[2]
Fair Value, Inputs, Level 1 [Member] | Guaranteed Insurance Contracts [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0	0.0	[3]
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		37.0	40.5
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0	0.0
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0	0.0
Fair Value, Inputs, Level 2 [Member] | Equity Securities, U.S. Large Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			0.0
Fair Value, Inputs, Level 2 [Member] | Equity Securities, U.S. Small Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			0.0
Fair Value, Inputs, Level 2 [Member] | Equity Securities, U.S. Index [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			0.0
Fair Value, Inputs, Level 2 [Member] | Equity Securities, International [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		23.4	23.8
Fair Value, Inputs, Level 2 [Member] | Fixed Income Funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		13.6	16.7
Fair Value, Inputs, Level 2 [Member] | Group Annuity Contract [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0	0.0	[2]
Fair Value, Inputs, Level 2 [Member] | Guaranteed Insurance Contracts [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0	0.0	[3]
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		2.6	3.0
Fair Value, Inputs, Level 3 [Member] | Real Estate [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0	0.0
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0	0.0
Fair Value, Inputs, Level 3 [Member] | Equity Securities, U.S. Large Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			0.0
Fair Value, Inputs, Level 3 [Member] | Equity Securities, U.S. Small Cap [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			0.0
Fair Value, Inputs, Level 3 [Member] | Equity Securities, U.S. Index [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			0.0
Fair Value, Inputs, Level 3 [Member] | Equity Securities, International [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0	0.0
Fair Value, Inputs, Level 3 [Member] | Fixed Income Funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0.0	0.0
Fair Value, Inputs, Level 3 [Member] | Group Annuity Contract [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		1.9	2.0	[2]
Fair Value, Inputs, Level 3 [Member] | Guaranteed Insurance Contracts [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		$ 0.7	$ 1.0	[3]

[1] Represents guaranteed insurance contracts, money market funds and cash

[2] Group annuity contracts are valued utilizing a discounted cash flow model. The term “cash flow” refers to the future principal and interest payments we expect to receive on a given asset in the general account. The model projects future cash flows separately for each investment period and each category of investment.

[3] Guaranteed insurance contracts are valued at book value, which approximates fair value, and are calculated using the prior year balance plus or minus investment returns and changes in cash flows.