Long-Term Debt (Details) In Millions, unless otherwise specified			0 Months Ended					3 Months Ended			3 Months Ended			3 Months Ended				3 Months Ended				1 Months Ended			1 Months Ended				1 Months Ended		3 Months Ended
	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Apr. 02, 2014 US Credit Agreement Revolving Credit Line USD ($)	May 01, 2015 US Credit Agreement Revolving Credit Line USD ($)	Mar. 31, 2015 US Credit Agreement Revolving Credit Line USD ($)	Mar. 31, 2015 US Credit Agreement Term Loan USD ($)	Dec. 31, 2014 US Credit Agreement Term Loan USD ($)	Mar. 31, 2015 UK Credit Agreement Revolving Credit Line USD ($)	Mar. 31, 2015 UK Credit Agreement Revolving Credit Line GBP (£)	Dec. 31, 2014 UK Credit Agreement Revolving Credit Line USD ($)	Mar. 31, 2015 UK Credit Agreement Revolving Credit Line Minimum	Mar. 31, 2015 UK Credit Agreement Revolving Credit Line Maximum	Apr. 30, 2015 UK Credit Agreement Revolving Credit Line Maximum Subsequent event GBP (£)	Mar. 31, 2015 U.K. Agreement Term Loan GBP (£)	Mar. 31, 2015 U.K. Agreement Term Loan USD ($)	Dec. 31, 2014 U.K. Agreement Term Loan USD ($)	Dec. 31, 2012 U.K. Agreement Term Loan GBP (£)	Mar. 31, 2015 U.K. Agreement Term Loan Minimum	Mar. 31, 2015 U.K. Agreement Term Loan Maximum	Mar. 31, 2015 UK Credit Agreement Overdraft Line of Credit	Dec. 31, 2014 UK Credit Agreement Overdraft Line of Credit USD ($)	Nov. 30, 2014 5.375% senior subordinated notes due 2024 USD ($)	Mar. 31, 2015 5.375% senior subordinated notes due 2024 USD ($)	Dec. 31, 2014 5.375% senior subordinated notes due 2024 USD ($)	Nov. 30, 2014 5.375% senior subordinated notes due 2024 Maximum Debt redemption prior to December 1, 2017	Aug. 31, 2012 5.75% senior subordinated notes due 2022 USD ($)	Mar. 31, 2015 5.75% senior subordinated notes due 2022 USD ($)	Dec. 31, 2014 5.75% senior subordinated notes due 2022 USD ($)	Aug. 31, 2012 5.75% senior subordinated notes due 2022 Maximum Debt redemption prior to October 1, 2015	Dec. 31, 2014 U.S. Commercial Truck Capital Loan USD ($)	Mar. 31, 2015 Australia working capital loan agreement USD ($)	Dec. 31, 2013 Australia working capital loan agreement USD ($)	Dec. 31, 2013 Australia working capital loan agreement AUD	Mar. 31, 2015 Mortgage facilities USD ($)	Dec. 31, 2014 Mortgage facilities USD ($)	Mar. 31, 2015 Other Debt Securities USD ($)	Dec. 31, 2014 Other Debt Securities USD ($)
Long Term Debt
Total long-term debt	$ 1,208.6	$ 1,352.6				$ 88.0	$ 88.0	$ 54.8		$ 121.5					$ 15.6	$ 18.7					$ 5.7		$ 300.0	$ 300.0			$ 550.0	$ 550.0		$ 60.5				$ 170.5	$ 169.7	$ 29.7	$ 38.5
Less: current portion	(34.5)	(36.6)
Net long-term debt	1,174.1	1,316.0
Interest rate (as a percent)																						5.375%	5.375%	5.375%		5.75%	5.75%	5.75%
Initial borrowing capacity			450.0
Revolving loans solely for future U.S. acquisitions				250.0
Maximum credit available				700.0					100.0				150.0				30.0															21.3	28.0
Base rate of interest on loans			LIBOR					LIBOR	LIBOR											Bank of England Base Rate											30-day Bill Rate
Line of credit basis spread on variable rate (as a percent)			2.00%								1.35%	3.00%								1.75%											2.35%
Incremental interest rate for uncollateralized borrowings in excess of maximum limit (as a percent)			1.50%
Balance outstanding under credit agreement					0	88.0		54.8	37.0					10.5	15.6															60.5	0			170.5
Repayment of term loan, quarterly installments														1.5
Frequency of principal repayments														Quarterly
Final payment due December 31, 2015														7.5
Low end of interest rate, depending on UK subsidiaries ratios (as a percent)																		2.675%
High end of interest rate, depending on UK subsidiaries ratios (as a percent)																			4.325%
Debt issued																						$ 300.0				$ 550.0
Specified equity offerings, percentage of debt which may be redeemed																									40.00%				40.00%
Change of control, redemption price as a percentage of principal																						101.00%				101.00%
Sale of assets, redemption price as percentage of principal																						100.00%				100.00%
Domestic Subsidiaries ownership guaranteeing obligations (as a percent)																							100.00%				100.00%