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Leases and Commitments (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Accrued Warranty Liability [Table Text Block]
The following is a rollforward of our accrued warranty liability ($ in millions):
Balance, January 1, 2016
$
61.0

Accruals for warranties issued during the year
59.6

Settlements made
(56.0
)
Additions due to acquisitions
0.5

Effect of foreign currency translation
(0.1
)
Balance, December 31, 2016
$
65.0

Accruals for warranties issued during the year
75.0

Settlements made
(72.3
)
Additions due to acquisitions
1.6

Effect of foreign currency translation
0.1

Balance, December 31, 2017
$
69.4