Fair Value of Derivative Instruments and Effect of Such Derivative Instruments on Consolidated Statements of Income and on Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Designated as Hedging Instrument
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Fair Value	$ 1.7		$ 1.7		$ 0.8
Liability Derivatives, Fair Value	1.1		1.1		0
Amount of Gains (Loss) Recognized in OCI	0.9	(0.2)	0	0
Designated as Hedging Instrument | Diesel fuel contracts
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Amount of Gains (Loss) Recognized in OCI	(0.8)	0.2	(1.0)	0
Designated as Hedging Instrument | Diesel fuel contracts | Other Current Assets
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Fair Value	0		0		0.3
Designated as Hedging Instrument | Diesel fuel contracts | Accounts Payable and Accrued Expenses
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Liability Derivatives, Fair Value	1.1		1.1		0
Liability Derivatives, Notional Amount, Volume			5.7
Designated as Hedging Instrument | Foreign Exchange Contract
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Amount of Gains (Loss) Recognized in OCI	1.7	(0.4)	1.0	0
Designated as Hedging Instrument | Foreign Exchange Contract | Other Current Assets
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Notional Amount	68.6		68.6
Asset Derivatives, Fair Value	1.7		1.7		0.5
Not Designated as Hedging Instrument
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Fair Value	0.3		0.3		2.4
Liability Derivatives, Fair Value	0.1		0.1		0
Amount of Gain (Loss) Recognized in Income	0.1	(0.8)	1.4	2.5
Not Designated as Hedging Instrument | Foreign Exchange Contract | Selling, General and Administrative Expenses
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) Recognized in Income	0	(0.1)	0	(0.1)
Not Designated as Hedging Instrument | Foreign Exchange Contract | Accounts Payable and Accrued Expenses
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Liability Derivatives, Notional Amount	1.6		1.6
Liability Derivatives, Fair Value	0.1		0.1		0
Not Designated as Hedging Instrument | Equity derivatives | Selling, General and Administrative Expenses
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) Recognized in Income	0.1	(0.7)	1.4	2.6
Not Designated as Hedging Instrument | Equity derivatives | Other Current Assets
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Notional Amount	26.6		26.6
Asset Derivatives, Fair Value	$ 0.3		$ 0.3		$ 2.4