Guarantees (Details) $ in Millions	Dec. 31, 2016 USD ($)
Guarantor Obligations
Total guarantees	$ 47.9
Guarantees expiring in less than one year	38.7
Guarantees expiring within one to three years	2.1
Guarantees with expiration over three years	7.1
Standby letters of credit
Guarantor Obligations
Total guarantees	29.4
Guarantees expiring in less than one year	27.9
Guarantees expiring within one to three years	1.5
Guarantees with expiration over three years	0.0
Surety bonds
Guarantor Obligations
Total guarantees	10.9
Guarantees expiring in less than one year	10.3
Guarantees expiring within one to three years	0.6
Guarantees with expiration over three years	0.0
Other guarantees
Guarantor Obligations
Total guarantees	7.6
Guarantees expiring in less than one year	0.5
Guarantees expiring within one to three years	0.0
Guarantees with expiration over three years	7.1
Other indemnification
Guarantor Obligations
Total guarantees	7.6
Liability related to workers compensation coverage	$ 7.1