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Leases and Commitments (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Accrued Warranty Liability The following is a rollforward of our accrued warranty liability ($ in millions):
Balance, January 1, 2017
$
60.4

Accruals for warranties issued during the year
73.5

Settlements made
(70.2
)
Additions due to acquisitions
1.6

Effect of foreign currency translation
—

Balance, December 31, 2017
$
65.3

Accruals for warranties issued during the year
81.7

Settlements made
(77.2
)
Additions due to acquisitions
2.6

Effect of foreign currency translation
(0.3
)
Balance, December 31, 2018
$
72.1