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		9 Months Ended
	Sep. 30, 2015 USD ($) gal	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) gal	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Designated as Hedging Instrument
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Fair Value	$ 12.4		$ 12.4		$ 2.8
Liability Derivatives, Fair Value	2.7		2.7		5.3
Amount of Gains (Loss) Recognized in OCI	2.3	$ 0.9	3.7	$ 0.0
Designated as Hedging Instrument | Foreign Exchange Contract
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Amount of Gains (Loss) Recognized in OCI	2.5	1.7	2.7	1.0
Designated as Hedging Instrument | Foreign Exchange Contract | Other Current Assets
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Notional Amount	123.6		123.6
Asset Derivatives, Fair Value	6.0		6.0		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	6.4		6.4		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	(0.2)	(0.8)	1.0	(1.0)
Designated as Hedging Instrument | Diesel fuel contracts | Accounts Payable and Accrued Liabilities
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Liability Derivatives, Fair Value	$ 2.7		$ 2.7		4.4
Liability Derivatives, Notional Amount, Volume | gal	3.2		3.2
Not Designated as Hedging Instrument
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Fair Value	$ 2.3		$ 2.3		2.8
Liability Derivatives, Fair Value	0.4		0.4		0.0
Amount of Gain (Loss) Recognized in Income	3.7	0.1	5.0	1.4
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	2.7	0.0	3.3	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	42.1		42.1
Asset Derivatives, Fair Value	2.3		2.3		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	1.0	$ 0.1	1.7	$ 1.4
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	32.2		32.2
Liability Derivatives, Fair Value	$ 0.4		$ 0.4		$ 0.0