Fair Value of Derivative Instruments and Effect of Such Derivative Instruments on Consolidated Statements of Income and on Other Comprehensive Income (Details) gal in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) gal	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) gal	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Designated as Hedging Instrument
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Fair Value	$ 3.2		$ 3.2		$ 2.8
Liability Derivatives, Fair Value	2.4		2.4		5.3
Amount of Gains (Loss) Recognized in OCI	(1.5)	$ (0.9)	1.4	$ (0.9)
Designated as Hedging Instrument | Foreign Exchange Contract
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Amount of Gains (Loss) Recognized in OCI	(2.3)	(0.9)	0.2	(0.7)
Designated as Hedging Instrument | Foreign Exchange Contract | Other Current Assets
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Notional Amount	121.0		121.0
Asset Derivatives, Fair Value	2.6		2.6		2.8
Designated as Hedging Instrument | Interest Rate Swap | Other Assets
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Notional Amount	300.0		300.0
Asset Derivatives, Fair Value	0.6		0.6		0.0
Designated as Hedging Instrument | Interest Rate Swap | Deferred And Other Long Term Liabilities
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Liability Derivatives, Fair Value	0.0		0.0		0.9
Designated as Hedging Instrument | Diesel fuel contracts
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Amount of Gains (Loss) Recognized in OCI	0.8	0.0	1.2	(0.2)
Designated as Hedging Instrument | Diesel fuel contracts | Accounts Payable and Accrued Liabilities
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Liability Derivatives, Fair Value	$ 2.4		$ 2.4		4.4
Liability Derivatives, Notional Amount, Volume | gal	3.3		3.3
Not Designated as Hedging Instrument
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Fair Value	$ 0.1		$ 0.1		2.8
Liability Derivatives, Fair Value	1.4		1.4		0.0
Amount of Gain (Loss) Recognized in Income	(2.0)	0.3	1.3	1.3
Not Designated as Hedging Instrument | Foreign Exchange Contract | Other Income (Expense), Net
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) Recognized in Income	(0.3)	0.0	0.6	0.0
Not Designated as Hedging Instrument | Foreign Exchange Contract | Other Current Assets
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Notional Amount	48.4		48.4
Asset Derivatives, Fair Value	0.1		0.1		0.0
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	(1.7)	$ 0.3	0.7	$ 1.3
Not Designated as Hedging Instrument | Equity derivatives | Other Current Assets
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Fair Value	0.0		0.0		2.8
Not Designated as Hedging Instrument | Equity derivatives | Other Current Liabilities
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Liability Derivatives, Notional Amount	31.6		31.6
Liability Derivatives, Fair Value	$ 1.4		$ 1.4		$ 0.0